Originally posted by: mugs
A counterfeit detection pen would have been useless. The reason a 1974 bill is suspicious is because:
1. It shouldn't be in circulation anymore
2. It's easiest to make a counterfeit of an older series bill. A 1974 bill wouldn't have a security strip or any of the modern security features in bills. Counterfeiters take $1 bills, bleach them, and make counterfeits of older series bills. Counterfeit pens can't detect them, and store cashiers can't tell that they're fake.
Im pretty sure the pens test the paper which hasnt changed in 100+ years.
