>...
> The simplest EMP protection is that of having none. If someone zaps the
> chip in an object and it is subsequently discovered that the object has
> a non-responding chip then the cashier or equivalent will tap it in by
> hand, by EAN or barcode, as usual. This is not a problem for the shop or
> the system. Think about how many times the cashier has to tap in the EAN
> because the barcode reader does not work on a product (about 5% bad
> reads are valid even by barcode reader manufacturer standards for a
> variety of reasons). Anybody who expects to be able to walk out of a
> shop with, say, a bottle of milk, without paying, because the bottle's
> barcode did not register at the cashier's needs help.