If the idea is to find friendly towns willing to deputize, I suggest that it be only towns or cities which have already deputized 'auxilliary', 'volunteer', 'reserve', 'contingent' officers. Even moreso if they already deputize 'animal-control officer', 'wildlife control officer', "traffic control officer" or anything else fairly innocuous.
For the record, I am perfectly willing to take a few days off of work every year and go do forensic computer analysis in some Podunk jurisdiction ... maybe even 'on demand' as cases arose. I'm qualified, and they couldn't afford my billable-hour rate. 'Volunteering' my time in exchange for minimum wage and credentials is in everyone's interest.
Rather than creating a perfectly-legal fiction, offering genuine service seems more consistent with our goals.