Ahmed Hassan has been remanded in custody to appear at the Old Bailey.
The law change would give police new powers to restrict offenders who are not known to the victim.
Relatives of the 19 people who died at Orchid View care home say questions remain about what happened.
Inmates often wait days to be seen because of a lack of staff, a senior psychiatrist says.
Amelia Blake is found dead in a flat in Sydney in a suspected murder-suicide, Australian media say.