SIR - How come one in five men and fewer than one in ten women become hooked on drugs while behind bars?

Why aren't all visitors searched thoroughly? Never mind the inconvenience to staff, the situation is out of hand and extreme measures must by introduced if we are to stop inmates getting drugs.

I have always been under the impression that sniffer dogs can find the smallest amount of drugs, so why aren't they used at visiting time?

Every parcel and letter should be checked and even kissing between visitors and prisoners banned because, as any film buff knows, it is so easy to pass drugs orally.

I agree with Shipley MP Philip Davies, who said it was "breathtaking" so many people could develop the habit in prison, adding "it should be one place where this does not happen" (T&A, November 23).

David Rhodes, Croscombe Walk, Bradford