Originally Posted by
stifle
Not getting into the legal argument, but I would postulate that a PIN is far easier to forge than a signature, on the grounds that someone looking over your shoulder when you enter your PIN is rather likely to be able to enter it himself straight away.
EMV/Chip cards require the physical card to authorise the transaction (assuming terminal is chip/EMV enabled, and the payment network will only accept transactions from terminals that use the chip/EMV). You would need to steal the card (not just clone it) to make the transaction. This is harder and more obvious than forging a signature.