That is definitely a huge issue, and one of the reasons I'm skeptical any sport can restart other than doing it via a very restrictive bubble(and even then it would be difficult). A lot of times the viral load where the test sample from(nasal passages/esophagus) may be low, but it may already be working it's way through the body and deeper into the bronchial tubes and lungs. Testing is incredibly unreliable, and while it may lower the chances of a big outbreak occurring... in the long run I don't see testing actually stopping it from preventing it from spreading through teams. Once that occurs, everything is pretty much ****ed. I don't even know if the NBA can do it. Football is going to be far more difficult to keep everything in a bubble. I think there is almost zero chance of a college football season occurring, and I think the chances of an NFL season playing to completion are below 15%(and that's being incredibly optimistic). I know a lot of people on here and throughout the football world want to be optimistic(I get it, football being cancelled would really suck) and think it can be done, there's just too many variables to control and I just don't see it happening.