Why are credit and debit cards unvalid unless signed?

Depends on who's running it, people that hav nothin better to do will ask u to sign the back,

Aiyayah on January 25, 2010, 7:25 pm

Normal people could careless if the back is sign... if they r concern'd they'd ask for id...

Aiyayah on January 25, 2010, 7:26 pm

you are acknowledging you are going to be bound by the cardholder agreement/terms of service

iamme on January 25, 2010, 7:51 pm

I refuse to sign them, identity theft is way easier with a signature

dbeer on January 25, 2010, 9:06 pm

Wrong it's for signature comparison with the signature on your I.d. such as your drivers license

SATMAN on January 26, 2010, 12:20 am

Mines not signed and its accepted

defender on January 26, 2010, 2:53 am

Hope I don't find it.

SATMAN on January 26, 2010, 6:25 am

I write, " Ask for ID" on the back where my signature is.suppose to be.

AUM1997 on January 27, 2010, 2:35 am