I have quite literally written a book about doping in sports. If Liverpool are at it there need to be a number of things at play... Firstly, nobody who knows about this conspiracy would have to ever break ranks on what would be the biggest scandal in British sporting history. Not one disgruntled former employee, player who moved on, shady lab tech...
Secondly, if Liverpool are at it, every Premier League club, or at least those at the top of the tree financially, are at it. Nothing stays secret in elite sport for long and Premier League footballers are actually pretty rigourously testsed, more than any other population of athletes in Britain. I'm sick of banging the drum on the bio passport but it basically rules out the possibility of the "miracle drug nobody else has" because it detects variations int the ratio of different chemicals and hormones in your blood. Unless they are doping in a way which leaves the blood chemistry completely unaltered, or in such miniscule quantities that they aren't tripping the tests then I don't see how they can be.
I do not discount the odd player around the league free-lancing with some dodgy sports scientist, but I do not buy into the idea that any team is running a team-wide doping programme.
My theory? Klopp is going to burn through players who just can't keep that pace up year in year out. They are disposable.