Friday 18 January 2013 17.30 GMT
Chemical castration: the soft option?
"More than 100 British sex offenders have volunteered for 'chemical castration'. But do the drugs make them harmless?
'Mark', a sex offender at HMP Whatton, Nottinghamshire: 'I just want to be normal.'
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. [ah, the good old days]"