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If Waterloo can have a roid scandal, anyone can. 

I wish I were equally trusting of their schoolwork and refusal of impermissible benefits.

There are no blood tests to prove whether someone did their own schoolwork or accepted a little cash under the table.

When I was in school, a friend who was an athlete told about a sorta-star football player walking into a store and collecting some items, and the cashier, recognizing him, told him to just have the items.
I don’t think he did because it was right after some kind of compliance refresher, but I’ve not doubts that happened again and someone didn’t say no.

I remember that... Crab legs, right? 

well, that certainly wasn't the 80's or even the 90's

I'm sure roiding was rampant in the 80s

was wondering if it's still happening today

Deep insider?  No.  But I've attended three different P5 schools and was aware of use at all three, and have heard use stories from alums at other Big Ten schools.  Not some massive program like what we saw in the 70s.  But the same way that kids at all accepted impermissible benefits.  Not cars, but a couple hundred bucks here, a $100 gift card there.  My take was that it was kids doing it on their own, which can obviously be dangerous.

I'd say that extrapolation from 3 programs to all programs is premature/irresponsible but the argument should actually come before that. 
You heard about some players. I doubt you watched them shoot up. Sure, that's not a realistic thing to expect. But you did type "promise." And said you'd be surprised if 25+ players per 100-man roster weren't tainted. I don't think you should even do that kind of extrapolation within the three teams you have one or a couple anecdotes for...let alone then extrapolate from those programs to all programs. 
Ultimately: You're talking about hearsay of a small sample (couple players) of a small sample (3 teams). I know you want to assign probabilities, but there's not enough info here to trust one's ability to assign real probabilities.
I don't have that info either and had to stop at calling it an educated guess. That impasse (we both guessed differently) is reasonable to me. A promise is impossible.

That is stronger. You should have started with that. It still sounds qualitative ("oh it definitely happens") and not quantitative ("at least 25 of 100 guys") though. Unless your next post includes a guarantee from these insiders in number.
In any event: still hearsay but it sounds increasingly credible. Bummer.
Did they mention the mode - steroids, red blood cells, EPO, that reindeer thing?

really?  the NCAA doesn't drug test any longer?  self testing by the schools themselves?

http://www.ncaa.org/sport-science-institute/topics/frequently-asked-questions-about-drug-testing