> Uh, wtf, since when? They're allowed to do this without a warrant? They just randomly drive along the streets and check heat signatures? "Emissions" are part

> Uh, wtf, since when? They're allowed to do this without a warrant? They just randomly drive along the streets and check heat signatures? "Emissions" are part of a Constitutional gray area because of the murky definition of privacy, but generally cops are allowed to utilize them. Heat signatures are not placed in the same category as wiretaps, but rather in the same category as walking down the street and happening to see something through someone's open window. The reasoning is that the heat information is "broadcasted" and therefore publicly available. And the cops don't cruise around examining heat signatures. They do fly-overs. That, and stake-outs.