I asked my midwife about co-sleeping at my booking appointment. I would be strongly advised not to do it because of the medication I'm currently on. It's amitripiline which has quite a mild sedative effect, but there are other drugs (legal and not legal) that are stronger cannabis, mirtazapine, any of the Z sleeping aids and any benziopidine (sp) would probably raise the risk a lot.
I think it would be more about the injuries, can't they usually tell if they are accidental or not?
DD1 breaks on average one bone a year (currently fingers, last year arm) and is covered in bruises constantly but she's a keen footballer which explains them all and I've never had so much as a phonecall.