One can imagine that this article (the subject matter) is a hot topic of conversation among lottery directors. Hopefully every state lottery has done this, or is planning to do this — undercover ticket redemption.
I hope that while they are going through this process that they also note which retailers refuse to pay out the prize. There is nothing more aggravating than taking a winning ticket to a retailer only to be told "we can't cash that ticket."
If a store wants to be a lottery retailer, they should be required to cash all winning tickets less than $600, no ifs, ands, or buts.