Breakdown of Landis' Tour de France drug tests

Updated: May 16, 2007, 11:34 AM ET
By Bonnie DeSimone | Special to ESPN.com

Floyd Landis was tested for performance-enhancing drugs eight times during the 2006 Tour de France. Six of the eight times he was tested, he either won the stage or was in the overall race lead, which triggers a mandatory test.

Only one of those tests, a sample taken on July 20 after Stage 17, met the standard for a doping violation, according to the U.S. Anti-Doping Agency. In April, over the objections of Landis' lawyers, the arbitration panel voted 2-1 to allow USADA to have the remaining seven "B" samples, or backup urine samples, tested at the same French laboratory that found the original positive.

USADA lawyer Richard Young said Monday that four of the seven "B" samples showed the presence of synthetic testosterone. The samples were not subjected to the carbon-isotope ratio detection method during the Tour because their corresponding "A" samples did not exceed the 4-to-1 testosterone-to-epitestosterone ratio that prompts the second test.

Landis' lawyers are disputing all of the results, saying that the standards for the carbon-isotope ratio test are being applied incorrectly. The "B" samples analyzed in April are not considered official positives because the "A" samples that would have confirmed them were destroyed by previous testing.

Lab technician Cynthia Mongongu, who performed the analysis of the "B" samples, testified Tuesday about her methodology and is sure to face hard questioning in cross-examination Wednesday.

Here are the dates Landis was tested, the corresponding Tour de France stages and what USADA argues the tests showed:

• July 3: Stage 2, a flat stage finishing in Esch-sur-Alzette, Luxembourg: Landis finished with the pack and stood in 11th place overall, 21 seconds behind race leader Thor Hushovd of Norway.
USADA: Landis' "A" and "B" samples tested negative.

• July 11: Stage 9, a flat stage from Bordeaux to Dax: Landis finished with the pack and stood in 2nd place overall, 1 minute behind race leader Serhiy Honchar of the Ukraine.
USADA: Landis' "A" and "B" samples tested negative.

• July 13: Stage 11, a mountain stage finishing in Pla-de-Beret, Spain: Landis finished third in a three-man sprint at the top and took the overall race lead for the first time by 8 seconds over French rider Cyril Dessel.
USADA: Landis' "A" sample tested negative; the "B" sample showed the presence of synthetic testosterone.

• July 14: Stage 12, a flat stage finishing in Carcassonne: Landis finished with the pack and remained in the overall lead by 8 seconds over Dessel.
USADA: Landis' "A" and "B" samples tested negative.

(Landis relinquished the leader's yellow jersey during Stage 13 when his Phonak team allowed a breakaway group to open up a half-hour margin, saying it was not strategically necessary to defend his lead at that point. Oscar Pereiro of Spain assumed the overall lead by 1:29 and kept it in Stage 14.)

• July 18: Stage 15, a mountain stage with an uphill finish on Alpe d'Huez: Landis finished tied for third, 1:10 behind stage winner Frank Schleck of Luxembourg. He regained the overall race lead by 10 seconds over Pereiro.
USADA: Landis' "A" sample tested negative; the "B" sample showed the presence of synthetic testosterone.

(Landis lost the lead to Pereiro again, involuntarily this time, after running out of energy during a disastrous ride in the Alps in Stage 16.)

• July 20: Stage 17, a mountain stage finishing in Morzine: This was Landis' comeback stage in which he left the peloton behind with a solo breakaway. He made up 8 minutes and scrambled back into second place overall, 30 seconds behind Pereiro.
USADA: Landis' "A" and "B" samples exceeded the allowable 4-to-1 testosterone-to-epitestosterone ratio and showed the presence of synthetic testosterone.

• July 22: Stage 19, individual time trial finishing in Montceau-les-Mines: Landis finished third in the time trial on a hilly course, 1:11 behind Honchar, enough to vault him back into the overall race lead by 59 seconds over Pereiro.
USADA: Landis' "A" sample tested negative; the "B" sample showed the presence of synthetic testosterone.

• July 23: Stage 20, the final day of the race, a flat stage ending in Paris: Landis finished with the pack and was awarded the race trophy on the Champs-Elysees.
USADA: Landis' "A" sample tested negative; the B sample showed the presence of synthetic testosterone.

Bonnie DeSimone is a frequent contributor to ESPN.com.