Quite a lot of riders have spilled the beans over the years, but unfortunately, the omerta has returned. So even a low level rider like Preidler who has admitted that he used blood transfusions has not said much to the public. But it's public info what was going on in the 00's, and high profile riders continued getting busted for a while, giving us some insight into the methods of the day.
I don't know what exact methods are used now, but I have no doubt that Martinez doped as a teenager, yes.
Froome went from doing nothing and without a contract, deemed the least talented rider on his team to winning* a GT overnight. That takes an injection of form. The former winner of that Vuelta was busted for blood doping, I hope you know?
But not a single high profile rider have been caught recently, and not a single clean rider who surely must have learned that this whole juiced up peloton that supposedly were riding clean said anything?? Very unlikely. In the 90's and 00's there were stories all the time. Now nothing.
Lenny doping as a teenager is wild! Zero evidence. None.
I must say that the froome reincarnation to superman was very strange to watch. Also for me (a naive idiot). Then again, he was simlply better than bardet and quintana on TT's, and he had an extremely strong team, and having a huge advantage in terms of legal performance methods. The fact that he won is not that wild. He maybe just was the tallest pygmy at that time perhaps?