I've received 2 counterfeit 100s (that I've known about) in two years of running my business. That's not a huge loss considering how rarely it happens and how much business we do, BUT coming off the heels of the last fake, I'm inclined to buy a detector.
We currently use the DriMark Counterfeit Detector Pen but these are useless against bleached bills. We also have a UV flashlight (for showing our scorpions off) that I didn't know would help with counterfeit detection.
I was going to just stop accepting 100s and maybe even 50s as there is a bank next door and 2 others on the block but I was curious what you all do to combat this type of scum.