They are CRIMINALS!!!!
Nobody is surrendering all their rights as citizens.
They should know who is at their shelters and if you don't like the thought of having an active arrest warrant on you or being a sexual offender or predator, DON'T DO THE CRIME.
There is NO WAY that the regular, law abiding citizens should have to surrender THEIR rights to safety just to appease the feely good nonsense of protecting those who have no respect for the rights of others.
So if you are going to a public place and availing yourself of government handouts, then yes, the safety of those in there is a valid concern and people should be willing to accept that scrutiny.
I'm thinking the police statement was more intended to keep criminals away from the shelters ("Don't go there, police will be there, you WILL be arrested").
As a matter of routine, they will be logging the identities of ALL people who enter the shelter, more to be able to respond to queries from frantic relatives/friends if the people's residences are destroyed by the storm.