Long-established postcard companies argued that the problem was newer firms “not knowing where to ‘draw the line’.” But the police attitude also hardened. “We have our own method of dealing with obscene postcards”, one Blackpool police officer noted in 1951: “Upon receiving a complaint from a member of the public, a plain clothes man is sent to buy a copy of the offending card. When the stationer says that he can see nothing wrong in the card, he is asked: ‘Would you send that card to your daughter?’ If the answer is ‘No’ - as it usually is - a prosecution may follow”.