I don't know about the US, but:
"The chemical caponisation of poultry is prohibited by EU legislation concerning the use of hormones in animals produced for food and applies in all Member States. The implementing legislation in the UK is The Animals and Animal Products."

Think about it - do you want to eat something that has had hormones injected or inserted that are strong enough to suppress male sexual characteristics? Do you want to feed this creature, complete with added hormones, to your children? Seems like a REALLY bad idea to me.