Just had a cashier tell me the same thing with my beta fish I bought walking through the nursery told me I needed to hold the beta fish above the RF security scanners while I'm walking out the door because it will kill the fish. I believe she had any aluminum foil hat underneath her wig too and I couldn't tell which way her eyes were looking so I had to look at her nose because if I looked at one and I she would look at me and it would immediately tool the other way so yeah that just happened
Well did you hold it above the RF scanner?