I've never had a problem with cashiers and $2 bills. I've heard some people have had problems, but this is the first time I've heard of someone being cuffed and taken to jail while they sorted it out.
Given that this happened several years ago, I certainly hope it hasn't continued.
PUT YOURSELF in Mike Bolesta's place. On the morning of Feb. 20, he buys a new radio-CD player for his 17-year-old son Christopher's car. He pays the $114 installation charge with 57 crisp new $2 bills, which, when last observed, were still considered legitimate currency in the United States proper. The $2 bills are Bolesta's idea of payment, and his little comic protest, too.
For this, Bolesta, Baltimore County resident, innocent citizen, owner of Capital City Student Tours, finds himself under arrest.
Finds himself, in front of a store full of customers at the Best Buy on York Road in Lutherville, locked into handcuffs and leg irons.
http://articles.baltimoresun.com/2005-03-08/news/0503080089_1_bolesta-pole-baltimore-county

What is the point of rules that are not enforced?