They don't do a search... Just don't lie about the obvious things like tattoos diseases etc... Gear - what they don't know can't hurt(they make sure your blood is ok to use if they need to... Don't worry about that and you could dtill end up helping someone(possibly, if your blood isn't too tainted

) they would just discard of it if no good!
Also self blood letting is not just sticking a spike into a vein... Read Bass' protocol(in my thread) he's the man for all that! It's not to be taken lightly that's for sure....