McDonald's is free to bar anyone from their premises. So no grounds to sue.

he could. You are lucky he didn't. Be nice...............

Bruising is a pretty common thing with plasma donation. Outside of proof they did something wrong and a serious injury there is nothing to sue for.

Yes they can.............................................

You are entitled to a refund, but that's it.

No but you can quit and report it to the health department.

Unprofessional, but not "illegal."....................

I am sure not matter we say you will be worried. This could well be a scam but none of us can know for certain.

As a general rule courts will not get involved in such matters.

you don't say why you think the nail salon is liable.