A vehicle being driven by the father of CSC stars Frank and Andy Schleck, was searched at the beginning of the 18th stage today.
The stage began in Bourg D'Oisans and Johnny Schleck is believed to have been stopped along with another vehicle from the Tour's caravan.
Customs chiefs stopped both vehicles, both of which were registered in Luxembourg, and searched them. However, an official later revealed that no doping products or illicit substances were found during the long search.
The vehicle from the caravan was being driven by a journalist and was allowed to proceed.
Johnny Schleck was a former professional himself, riding with the Belgian star Eddy Merckx.
Frank (pictured with brother Andy) is currently second in the overall classification, 1-24 behind teammate Carlos Sastre, whilst Andy is currently leading the young riders' classification.
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TOUR DE FRANCE 2008: STAGE REPORTS
Stage 18: Burghardt shows that Columbia can win without Cav
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Stage 17: Sastre wins on Alpe d'Huez, takes lead
Stage 16: Dessel wins
Stage 15: Schleck takes lead in the Alps
Stage 14: Oscar Freire wins in Digne-les-Bains
Stage 13: Cavendish takes fourth win
Stage 12: Cavendish makes it three
Stage 11: Arvesen wins
Stage 10: Evans takes yellow jersey by one second
Stage nine: Ricco wins in the Pyrenees
Stage eight: Cavendish wins again in Toulouse
Stage seven: Sanchez takes action-packed stage
Stage six: Ricco storms to win
Stage five: Cavendish takes first Tour win
Stage four: Schumacher wins TT and takes race lead
Stage three: Dumoulin wins stage from break
Stage two: Hushovd wins chaotic sprint
Stage one: Valverde wins
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TOUR DE FRANCE 2008: NEWS
Schlecks' father's car searched
Analysis: tactical battle on L'Alpe d'Huez [stage 17]
Schleck promises to attack main rivals
Schleck ready to defend Tour lead [stage 15]
Rest day news round-up [July 21]
Saunier Duval riders: "We are honest"
Cavendish talks to Cycling Weekly after quitting Tour
Schleck savours first ever Tour de France jersey [stage 15]
Comment: Why Cav is right to go home today
Cavendish pulls out of the Tour
Barloworld to end cycling sponsorship
Ricco speaks on Italian television
Cavendish joins the all-time greats
Saunier Duval sack Ricco and Piepoli
Tour bosses say fight against doping continues
Ricco denies doping at the Tour
Saunier Duval pull out of Tour
Tour's top ten changes
Ricco positive for EPO at Tour
Analysis: Tour de France rest day summary
Cavendish battles through Pyrenees
Evans suffers but takes yellow jersey [stage 10]
Analysis: Hautacam shakes up 2008 Tour
Ricco silences critics with solo attack in Pyrenees [stage nine]
Cavendish talks about his second stage win [stage eight]
Beltran heads home but doubts remain about other Tour riders
David Millar: the dope controls are working
Manuel Beltran tests positive for EPO at the Tour
Comment: How the Tour rediscovered its spirit
Doping back in Tour de France headlines
Millar: close but no cigar in Super-Besse [stage six]
Super-Besse shows form of main contenders [stage six]
Millar to go for yellow [stage six]
Team Columbia's reaction to Cavendish's win [stage five]
Cavendish talks about his Tour stage win
Tour comment: Why Evans should be happy [stage four]
Millar: Still aiming for Tour yellow jersey [stage 4]
Who is Romain Feillu?
Cavendish disappointed with stage two result
Millar too close to Tour yellow jersey
Stage 2 preview: A sprint finish for Cavendish?
Millar happy after gains precious seconds in Plumelec
Valverde delighted with opening Tour stage win
Comment: Is Valverde's win a good thing for the Tour?
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