Paris ? A 19-month doping probe into Lance Armstrong’s cycling team has yielded no evidence of wrongdoing and will end this summer.

“Between now and the end of the summer, it will be closed,” Francois Franchi, an assistant to the Paris prosecutor, told The Associated Press.

Asked whether tests showed any evidence of doping, Franchi said: “There has been no positive test. I don’t think there will be any more tests.”

The U.S. Postal team says it respects anti-doping rules. Armstrong, who won the Tour de France for a third straight time last year, has repeatedly denied taking banned substances.

He has never failed a drug test, but in France he has been dogged by suspicions of doping.

The probe into whether Armstrong’s U.S. Postal Service team violated anti-doping rules in the 2000 Tour de France began in November of that year.

It was launched after a French TV crew filmed U.S. Postal staff disposing of bags of medical waste, including packaging for Actovegin, a substance made from extracts of calf’s blood. Some believe it boosts oxygen levels in the blood.

Cycling’s governing body, the UCI, doesn’t list Actovegin as a banned substance but prohibits pharmacological or chemical manipulations of blood.

U.S. Postal said none of its riders used Actovegin, which was on hand for treating severe skin abrasions caused by crashes, and for use by a staff member with diabetes.

Franchi said experts tested blood and urine samples taken from the U.S. Postal team at the 2000 Tour and would have liked to conduct further tests on riders, who refused.

“He (Armstrong) is entirely within his rights to do so,” Franchi said. Franchi added that it was up to investigating judge Sophie-Helene Chateau to decide when to end the probe.

“I consider this issue dead,” Armstrong said.