I'm not sure how it would work, but ,if we can do rapid testing for covid etc, surely a reliable testing kit can be manufactured? Anyway ,the Union and MLB need to figure this out , this seems unreliable Test for what? How do you measure "sticky"? Either it is or it isn't (to the touch). You don't have to know the chemical composition of the substance. It is sticky. The fact that is a dark substance and easily seen is another matter. There must be clear stick substances that wouldn't have raised suspicion. (looking for better ways to cheat) Later