Very interesting - thanks for giving us the benefit of your experience.

In the case of store workers, it's not obvious what other checking they could do. The only reasonable use I can see is for them to keep an eye on the person that has been flagged. But I expect that the entire purpose of this tech is to reduce the number of store guards they need to pay, so they are likely not to have the manpower. If the policy is 'don't let them in the store', I don't see how a store worker can avoid making false accusations.