Could have been part of their in store security or just some bs story he made up. That is why I included how I was told. I have no insight into it other than what he said. The only card readers i have experience with are connected to computers and you sign a printed receipt not a screen or pad. The option to do that was available but most credit cards were put in an online reservation system and you had to sign a rental agreement at check in that allowed them t to charge ffor damages discovered after checkout so the paper was already wasted.