same would apply for anyone.
for example if we went to school together, I could claim that I saw you use drugs back then.
since the burden of proof is on the accuser and, while my statement is a type of accusation it's not an accusation (as far as an accusation in court).
in order for the case to be brought to court, you'd have to claim I was spreading damaging lies about you. you'd have to prove that I said it, that it wasn't true, and that it in some way damaged you.
I don't really have to prove anything, just defend against your claims.
so while you might have no trouble proving it was said (witnesses), and that it was damaging(effected your reputation), how would you go about proving it was a lie?
you could bring up witnesses that would say that they never saw you use drugs. but unless you where never alone, and where able to produce witnesses who could account for you not using for every minute of that time, there would still be holes where I could have seen what I say.
it's virtually imposable to prove you didn't do something, unless the accuser is willing to put exact details (like time and place) into their lie, and they won't. most people who trade in this sort of hype know the game well enough to either leave these details out or strategically insert terms like "in my opinion", "allegedly", or "claims have been made that..."
