The average tourist will only have a brush with the law if they're robbed by a bag-snatcher or pickpocket, or if their car is towed away.
In an emergency (to report theft, robbery, assault or accidents) call 113 or 112 – the latter has a reply service in a number of languages.
Italy's Police Forces
There are six national police forces in Italy, as well as a number of local police forces. The main ones are shown in the table.
polizia di stato (civil national police)
thefts, visa extensions and permits; based at the local questura (police station)
powder-blue trousers with a fuchsia stripe and a navy-blue jacket
arma dei carabinieri (military police)
general crime, public order and drug enforcement (often overlapping with the polizia di stato)
black uniform with a red stripe
polizia municipale (aka vigili urbani; municipal police)
parking tickets, towed cars, public order, petty crime
varies according to province