Chemical castration: the soft option?

More than 100 British sex offenders have volunteered for 'chemical castration'. But do the drugs make them harmless?
Barry was sentenced to life in prison in 1976 for murdering a man, a random stranger who'd refused him a light for his cigarette. He didn't think of himself as a sex offender. He is a voyeur – "That's my thing. I like to look" – and has never been convicted of a sexual offence.