The NHL has sent players to FOUR olympic games (which operate on seperate drug testing protocols than the NHL). How many of those potential players tested positive for banned substances? One- Jose Theodore who tested positive because he was using Propecia (helps with male pattern baldness and happens to be on the IOC banned list). If Laraque was correct, then surely you'd have someone test positive for something (the NFL and MLB don't have to worry about falling under IOC protocols as they don't sent athletes to the Olympics).
Laraque tries to hide behind the "yes but their performance dips during Olympic years" lie. Unfortunately, there is zero statistical evidence to back any of this up (while there are deviations, any difference in production of <10% in PPG is largely circumstancial and can be attributed to a number of factors). I looked at 25 Olympians from four countries who have played in multiple Olympics...none of the 25 had any significant dips/drops in production.
Is there a problem with steroids? No. If there is a drug that has potential for abuse it would be HGH because it specifically helps with recovery and doesn't have the side effects that steroids do (plus, steroids might help you bulk up, but they are brutal with your endurance; watch a body builder try to run any length and they seize up).
The NHLPA is doing what any union would do- protect their members' rights (and by that, not subjecting them to drug testing).
Year-round testing would probably not be a bad thing (or at least tack on one "out of competition" test to the existing three in-season tests) but like anything else, this has to be negotiated into the CBA. Laraque, I would assume, knows this.
Nobody can independently verify what Laraque is saying, and I can't refute and confirm his allegations.