"retroactive" laws are unconstitutional. Those are Ex Post Facto Laws.
That's the dilemma here. The law may be needed, the intent good and 'for the children', but illegal.
This could go to SCOTUS to be sorted out.
Brown is posing for the cameras.
He is also being very free with the tax dollars to fight this.
How about this, tax breaks for land lords of apartments who prohibit convicted sex offenders from living in their appartments.
Convicted felons are not subject to fair housing or discrimination laws. So you give the land lord a $500 per year discount if he puts a written clause in his lease with and actually does a $35 criminal back ground check.
No ex post facto constitutional violation of state or federal constitutions.