We don't know for sure whether there is. For that kind of knowledge there would have to be discoveries like those that took place in professional cycling. That being said, there are enough Olympic athletes who have been caught that anyone who doesn't suspect that others (perhaps many others) have taken drugs and haven't been caught are probably in denial. At least some doctors who give athletes these drugs work across sports (Michele Ferrari is known both in cycling circles and soccer circles) and since the question asks if its systemic, yes it is because these doctors make a business out of this. Whether it's 10%, 30%, 50%, or 80% of Olympic athletes who dope, I don't know.
Yes, There Is Widespread Systemic Use of Banned Performance-Enhancing Drugs by Olympic Athletes. Every olympics multiple athletes are banned either leading up to the games or during and after the games for using Performance enhancing drugs. It's just something that will always be present because of the amount of money that can be made for winning a gold medal.
There is probably rampant doping and PED use in just about every sport from table tennis to pro football. Olympians are no different as they try to get a competitive edge. Getting around the drug tests is the trick. Lance Armstrong fooled Tour de France officials for years. Surely Olympic athletes do the same thing.
Like other sport leagues, Olympians use performance-enhancing drugs at fairly high rates. Many athletes never get caught, but plenty of them do get caught and face punishments. There are a nearly limitless number of PEDs, and not all of them are banned. Either way, athletes in every sport use banned PEDs, and finding them isn't always easy.
As it has been seen, there is widespread use of performance enhancing drugs among Olympic athletes. Although these users may not get caught immediately, once scientists have developed tests to identify the drugs, these athletes will be stripped of their medals. Countries like China and Russia are suspected of using performance enhancing drugs.
With so many athletes competing in the Olympics at such a high competitive level it is definitely likely there is a wide spread use of performance enhancing drugs going on. There are drug testing measures in place and sometimes people get caught but it is not going ot catch everyone.
In today's day and age, it is naive to think that those who want to win in athletics will not use performance enhancing drugs, and that includes those who make it to the top levels of the Olympics. We live in a culture where these types of things are expected, and if it is not acceptable then everyone must be tested who participates.
It should be too much of a risk for an athlete to put his career on the line for just a drug so I do not think that there is widespread use of them due to that fact because we can rest assured that they are all aware that a drug test can be expected from them at anytime.