The testing of former triple Olympic champion Marion Jones's 'B' sample should take place this week, her lawyer said.

"It is going to be done the second half of this week," Howard Jacobs told Reuters in a telephone interview from his Los Angeles-area office.

Jones's initial sample tested positive for the banned blood-boosting drug erythropoietin (EPO) at the US Championships in Indianapolis in June.

If the second sample is also positive, the 30-year-old faces a two-year ban from the sport, although she can appeal to an arbitration hearing.

Jacobs said the second test would be conducted at the UCLA Olympic Analytical Laboratory in Los Angeles.

"The protocol is the same lab (as the first test), different technician," he said.

He would not speculate on the results.

Jones, who won five medals at the 2000 Sydney Olympics, has repeatedly denied taking performance-enhancing substances and had never previously failed a doping test.

She had been under scrutiny by the US Anti-Doping Agency (USADA) in connection with the BALCO laboratory doping scandal but had never been charged with a doping offence.

Jones said in a statement last week she was shocked by the positive test and requested her second or 'B' sample test be done as soon as possible.

Jacobs, who also represents cyclist Floyd Landis, said there were no new developments in the American rider's case.

"I am still waiting for the (test) documents," Jacobs said.

Landis tested positive for the male sex hormone testosterone during this year's Tour de France which he won.

He has denied knowingly taking banned substances.