Gen Viro test accuracy is stated at over 95%. Is there a way to find out what the accuracy is for the other products that have already been approved?

My son-in-law tested positive 3 weeks ago in Seattle, but a second test this week was negative. He works in the health industry, so it was required to return to work. Doubtful he every had it as he had no symptoms. Seems like accuracy should be a significant item. Thanks for all of your guys information in previous posts.