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The British and Irish Lions routinely sweep their hotel rooms and team facilities in New Zealand for listening devices, chief executive John Feehan has confirmed.
The Lions are employing the same security company that carried out such checks during the 2009 tour of South Africa and 2013 tour of Australia, Feehan added.
"They are experts in electronic surveillance, to ensure that we are not being looked at or listened to," Feehan told The Telegraph.
"The team room, for example, is swept regularly and no one is allowed in there unless they are part of the squad, and if there is any suspicion at all they will do another sweep.
"Nothing is perfect in this life and if someone is determined enough they probably will get something, but all we can do is try to ensure that they don't."
More and more security consultants are being hired by international rugby teams as they attempt to prevent opposition sides from discovering their tactics.
The All Blacks were notably targeted in 2013 when a British newspaper reporter gained access to the team room in their hotel and revealed some of the planning and motivational messages written on a whiteboard.
Lions tours to New Zealand: the most iconic photos through the yearsShow all 38 1 /38Lions tours to New Zealand: the most iconic photos through the years Lions tours to New Zealand: the most iconic photos through the years 1977 | NZ Jnrs 9 Lions 19 | Mudmen. Lions forwards Allan Martin, Phil Orr, Moss Keane, and Fran Cotton are covered head-to-toe in the Wellington mud as they wait for in a line-out at Athletic Park. The weather would greatly add to the challenge faced by the tourists, with unusually high rainfall for the entirety of the three months invariably falling in the towns where the Lions had their twenty-five games, adding to the siege mentality engendered by the grueling schedule and largely limiting the chances of their quick-fire backs to express their creativity
Colorsport / Colin Elsey
Lions tours to New Zealand: the most iconic photos through the years 1993 | 1st Test: NZ 20 Lions 18 | Lions captain Gavin Hastings faces down the Haka in a manner that would be impossible today, before the opening test match at Christchurch
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Lions tours to New Zealand: the most iconic photos through the years 1971 | 2nd Test: NZ 22 Lions 12 | Gareth Edwards, under pressure from Sid Going and Ian Kirkpatrick, dive-passes to half-back partner Barry John
Colorsport / Peter Bush
Lions tours to New Zealand: the most iconic photos through the years 2005 | 3rd Test: NZ 38 Lions 19 | Lions prop Graham Rowntree sports a bloodied ear during another heavy defeat in the final test
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Lions tours to New Zealand: the most iconic photos through the years 1993 | 3rd Test: NZ 30 Lions 13 | Gavin Hastings and Rory Underwood are devastated after the heavy loss in the deciding test
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Lions tours to New Zealand: the most iconic photos through the years 2005 1st Test: NZ 21 Lions 3 | Captain Brian O'Driscoll in agony as he is attended by team doctor James Robson after the infamous spear tackle by opposite captain Tana Umaga, and Keven Mealamu
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Lions tours to New Zealand: the most iconic photos through the years 1993 | Waikato 38 Lions 10 | Current Lions head coach Warren Gatland scrums down for Waikato during a famous victory for the North Island club in the midweek before the deciding final test match. The hooker also scored a try
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Lions tours to New Zealand: the most iconic photos through the years 1977 | North Auckland 7 Lions 18 | Ian McGeechan, one of the greatest figures in the history of the Lions as a player and a coach, crosses for a try at Okara Park, Whangarei
Colorsport / Colin Elsey
Lions tours to New Zealand: the most iconic photos through the years 1983 | Willie John McBride – perhaps the greatest figure in Lions history after five tours as a player including victories in New Zealand and South Africa - talks to the press after a training session in his tour manager role, as some local school girls looking on
Colorsport / Colin Elsey
Lions tours to New Zealand: the most iconic photos through the years 1993 | 3rd Test: NZ 30 Lions 13 | Jon Preston rounds full back Hastings to score one of the All Blacks three tries
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Lions tours to New Zealand: the most iconic photos through the years 1993 | 1st Test: NZ 20 Lions 18 | Lions scrum-half Dewi Morris can not believe that Australian referee Brian Kinsey has awarded the All Blacks the penalty in the dying moments that Grant Fix would duly kick to win the game
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Lions tours to New Zealand: the most iconic photos through the years 1993 | 2nd Test: NZ 7 Lion 20 | Rory Underwood dives over for the Lions only try of the game as they secure a victory to level the series
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Lions tours to New Zealand: the most iconic photos through the years 1993 | 2nd Test: NZ 7 Lion 20 | Nick Popplewell charges through the All Black defence, with a young Martin Johnson in support
Colorsport / Colin Elsey
Lions tours to New Zealand: the most iconic photos through the years 1971 | Pre-departure training session in Eastbourne | 2017 tour manager John Spencer (right) looks on with Gerald Davies as David Duckham passes the ball
Colorsport / Colin Elsey
Lions tours to New Zealand: the most iconic photos through the years 1983 | 3rd Test: NZ 15 Lions 8 | All Black forwards Andy Haden and Murray Mexted battle the Lions in the wet at Dunedin's Carisbrook
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Lions tours to New Zealand: the most iconic photos through the years 1993 | 2nd Test: NZ 7 Lion 20 | Captain Gavin Hastings carrying the team mascot, followed by Brian Moore, as he runs out for the second test at Wellington
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Lions tours to New Zealand: the most iconic photos through the years 1977 | Training session at Westport | Hooker Bobby Windsor practices his line-out throwing surrounded by hordes of school children during practice before the game against West Coast-Buller
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Lions tours to New Zealand: the most iconic photos through the years 1977 | 4th Test: NZ 10 Lions 9 | Tony Neary runs out for the Lions, followed by Bill Beaumont and Graham Price, at Auckland's Eden Park, with an opportunity to tie the series with a victory
Colorsport / Colin Elsey
Lions tours to New Zealand: the most iconic photos through the years 1977 | 4th Test: NZ 10 Lions 9 | Lions captain Phil Bennett is swamped by All Blacks tacklers in the final test, a suitable illustration of the pressure he was under both on and off the field during this tour. Despite all the obstacles they faced and eventually losing 3-1, the Lions came extremely close to winning this series. They lost the first test through an opportunist breakaway try, won the second, dominated forward possession in the third whilst conspiring to lose, and went down by just a single point in the final game
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Lions tours to New Zealand: the most iconic photos through the years 1983 | 4th Test: NZ 38 Lions 6 | Scrum-half David Loveridge breaks with plenty of teammates in support
Colorsport / Colin Elsey
Lions tours to New Zealand: the most iconic photos through the years 1983 | 4th Test: NZ 38 Lions 6 | [l-r] Geoff Old, Andy Haden, and Murray Mexted celebrate the All Blacks 4-0 series victory
Colorsport / Colin Elsey
Lions tours to New Zealand: the most iconic photos through the years 1977 | 2nd Test: NZ 9 Lions 13 | Bill Beaumont is surrounded by All Blacks as he scrambles for the ball at Lancaster Park
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Lions tours to New Zealand: the most iconic photos through the years 2005 | Prince William watches a training session with tour manager Bill Beaumont before the second test.
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Lions tours to New Zealand: the most iconic photos through the years 1983 | 2nd Test: NZ 9 Lions 0 | Fly half Wayne Smith, currently assistant coach of the All Blacks, leaves David Irwin floundering during the second test at Wellington
Colorsport / Colin Elsey
Lions tours to New Zealand: the most iconic photos through the years 2005 | Otago 19 Lions 13 | Shane Williams and his Lions teammates before kick-off in Dunedin
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Lions tours to New Zealand: the most iconic photos through the years 2005 | 2nd Test: NZ 48 Lions 18 | Jason Robinson is smashed backwards by Dan Carter and an All Black teammate
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Lions tours to New Zealand: the most iconic photos through the years 1983 | 4th Test: NZ 38 Lions 6 | Winger Stu Wilson on the way to scoring the first try of his hat-trick - breaking Ian Kirkpatrick's record for test tries in the process - in the emphatic All Black victory in the final test
Colorsport / Colin Elsey
Lions tours to New Zealand: the most iconic photos through the years 2005 | 3rd Test: NZ 38 Lions 19 | Rico Gear scores the final try of the series. Remarkably it is the twelfth in the three games for the home side
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Lions tours to New Zealand: the most iconic photos through the years 1983 | Stash! Ireland fly-half Ollie Campbell shows off his Bukta kit bag prior to departure in 1983
Colorsport / Colin Elsey
Lions tours to New Zealand: the most iconic photos through the years 1977 | 2nd Test: NZ 9 Lions 13 | Prop Graham Price – who won a record 12 caps in succession for the Lions, playing in every game across three tours - falls to the ground under the feet and fists of opposing front row Billy Bush as tempers flare in Christchurch. The Lions won the game 13-9 to bring the series level
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Lions tours to New Zealand: the most iconic photos through the years 1977 | 2nd Test: NZ 9 Lions 13 | Prop Graham Price – who won a record 12 caps in succession for the Lions, playing in every game across three tours - falls to the ground under the feet and fists of opposing front row Billy Bush as tempers flare in Christchurch. The Lions won the game 13-9 to bring the series level
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Lions tours to New Zealand: the most iconic photos through the years 1977 | Lions 45 West Coast-Buller 0 | Lions players huddle under towels in the team bus as there were no changing rooms at the ground to shower in after the wet and muddy game at Westport
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Lions tours to New Zealand: the most iconic photos through the years 1971 | 4th Test: NZ 13 Lions 13 | Peter Whiting stands over Lions lock Gordon Brown after punching him to the ground in the first line-out of the game
Colorsport / Peter Bush
Lions tours to New Zealand: the most iconic photos through the years 1971 | 4th Test: NZ 13 Lions 13 | The captains, Colin Meads of the All Blacks and John Dawes of the Lions, lead their teams out for the final test at Auckland's Eden Park, with the Lions leading the series 2-1
Colorsport / Peter Bush
Lions tours to New Zealand: the most iconic photos through the years 2005 | 3rd Test: NZ 38 Lions 19 | The All Blacks celebrate – the late Jerry Collins in a Lions jersey - with the series trophy after completing the heaviest whitewash over the Lions in their history
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Lions tours to New Zealand: the most iconic photos through the years 1993 | The Lions squad gather in their blazers prior to departure
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Lions tours to New Zealand: the most iconic photos through the years 2005 | 2nd Test: NZ 48 Lions 18 | Tempers flare during the Lions' heavy defeat in Wellington
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Lions tours to New Zealand: the most iconic photos through the years 1971 | 4th Test: NZ 13 Lions 13 | Lions captain John Dawes, alongside tour manager Doug Smith, addresses the crowd after securing the series victory with a 13-all draw. It was the Lions' first overall triumph in New Zealand after seven attempts, and remains the sole victorious tour; in the four subsequent trips they have won only two of the fourteen tests played
Colorsport / Peter Bush
All Blacks head coach Steve Hansen has also accused foreign reporters of covertly filming the side’s practice sessions.
In a bid to deter the press at the last Rugby World Cup in England, Hansen’s men trained behind a four-metre fence.
The Lions and All Blacks meet in their first Test match of the tour this Saturday at Eden Park in Auckland.
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