I just read news that the IOC is going to act and start testing samples retroactively. Reportedly, some newly developed testing method allows detection of previously undetectable steroids. It seems that they were previously only detectable for a few hours after ingestion, and with this new method, they can be found after up to 6 months. 6 months does reach back to and well into the PED-user's "charging-up" season, in which they sometimes even move to hard to reach areas to juice up freely.
Apparently, some laboratories have tested samples from 2012 and there's "hundreds of new positives". There has been attempts to uncover it all in sports such as cycling, but in the end, mafia-like organizations and practices prevented it from happeing. IOC can't afford the costs in popularity this would have if they looked the other way. With the amount of money Olympic Games move, their only acceptable stance against PED-usage is to confront it directly.
Life bans at first positive, Taking back all prices and honors. Retroactively testing every conserved sample upon discovery of new testing methods. This is the only way they can stop it, making it so everyone knows they can't get away forever, and sooner and later they will be turned into villains.
Here's the link: