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Supposedly tamper-proof sample bottles redesigned after Russian doping scandal

London 2012 Unveil the Anti-Doping Laboratory For The Olympic Games

HARLOW, ENGLAND - JANUARY 19: A tray of samples in the anti-doping laboratory which will test athlete’s samples from the London 2012 Games on January 19, 2012 in Harlow, England. The facility, which will be provided by GSK and operated by King’s College London, will test over 6250 samples throughout the Olympic and Paralympic Games. Over 150 anti-doping scientists will work in the laboratory, which measures the size of seven tennis courts, 24 hours a day. (Photo by Oli Scarff/Getty Images)

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LONDON (AP) The manufacturers of the doping sample bottles supposedly tampered with by Russian intelligence agents have introduced a new design in the last month to try to stay one step ahead of cheating scientists.

World Anti-Doping Agency investigator Richard McLaren found that FSB agents tampered with samples during the 2014 Sochi Winter Olympics, leaving no sign of scratches or marks to untrained eyes.

Expert testimony in McLaren’s latest report revealed how thin strips of medal could push up a ring around the bottle’s neck, allowing the Russians to replace dirty samples with clean urine.

Berlinger, the Swiss company that makes the bottles, is working with law enforcement specialists in Europe to perfect designs that are harder to break into undetected. A new bottle went into circulation on Nov. 15 for doping testing, although Berlinger declined to outline the new safety measures.

“We work with forensic specialists from different nations,” Berlinger spokesman Hans Klaus said during a visit to London. “We want to always stay a little bit ahead of those cheating but you cannot avoid a system like the Russians built up.”

MORE: Over 1,000 Russian athletes involved in organized doping, McLaren report says