Just so we're clear, across all these statutes, the term "private" means "for private use". State and local governments can engage private firms to collect data in all of them.
I wonder how this figures in with states that don't permit any ALPR use by non-law enforcement. Presumably in those localities private entities can't collect ALPR data on behalf of law enforcement.
This page has some more background (and the most amusing map legend I've seen in awhile):