Honestly with the ever evoving technology these days there's really not much you can do to deter a determined criminal. Instead I keep a close eye on my daily transactions, and alert the bank of any suspicious activity.
Also this is why I don't use debit cards, especially when they offer less protection than credit cards.
Even if you detect a bluetooth signal at a gas pump it could be comming from the car next to you it isn't necessarly a skimmer.
