This is in Canada so it should be the same as the US, anyways I tried renting Hannibal recently and I was alone using my moms card, they needed to call her confirming I was allowed to rent it.
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I wouldn't rent with blockbuster, they are way more expensive than all the other DVD rental shops and postal services and because of this one of their biggest stores went bust and I never see anyone in a blockbuster each time I walk past one.
Yeah they check IDs but in NI xtravision is what its called and it's basically a bunch of mid life crisis people behind the counter so you can get 18's if your 12.