NO but I had one guy yesterday want to give me 100 $1 coins. I made him go to the Kroger to change them into bills.
I have used this: http://dx.com/p/counterfeit-fake-money-bank-note-detector-pen-uv-light-tester-purple-3-x-lr1130-68359 It allows two methods: U/V lights, and also ink method. Have used it, no counterfeits so far. I actually have about 30 of those, you can get one for free if you come to Helsinki, Finland ;)