There is far more money in creating the PEDs than there is in the testing. Do you remember the BALCO scandal?
https://www.usada.org/announcement/dates-associated-with-the-balco-doping-conspiracy/
There are MANY such groups out there. I suspect Casey Cunningham and David Taylor's bro to be one of these designer steroid guys. Sam Calavitta.
As one poster states: "here are drugs that flush EPO out of your system immediately, and although there are quantitative methods for them, the half life is so small that I doubt USADA has a proper protocol in place for such methods based on how they bust doors down for random samples. This scenario is ***ducked** on a lot of levels because it's EPO and not a traditional steroid."
testing sucks, smart people are dead set on cheating, and they know how to get away with it. there is a massive EPO issue going on in wrestling.