Ato Boldon can't be trusted...and thank goodness for that.

Being described as untrustworthy is normally deeply insulting, but when you're dealing with people who have a morality of their own, it's actually quite complimentary, as this country's most consistently successful athlete ever has been finding out recently.

And with a couple of influential cheats in the shady underworld of performance-enhanced athletics expected to be whistling like contented picoplats from today, maintaining a comfortable distance from those already tainted by the broadening brush of drug cheats is obviously the way to go, especially as they'll be trying to take as many with them on the way down.

Depending on your perspective, the next few days could be either disturbingly dark or reassuringly illuminating as the trial of disgraced track coach Trevor Graham resumes in the United States today with Guillermo Angel Heredia, a former Mexican discus thrower and key supplier of banned substances to a number of high-profile athletes, scheduled to testify and essentially make factual what many have suspected all along.

There are genuine fears that the impact of the testimony emanating from the courtroom in San Francisco, especially in an Olympic year, could do irreparable harm to the already tainted integrity of the sport and generate the sort of scandal that has seriously compromised the prestige and international prominence of cycling's premier road racing event, the Tour de France.