Crazy,
Don't matter its still public service rules, and has to be twinned regardless of whether flying over one person, one sheep or a whole city...the notion is, for safety = twin. Also to carry the necessary equipment and fly in not brilliant weather conditions and pretty much around a clock, the single engine or single engined piston ain't gonna work.
Back in the late 70s, 80s, there were trials and use of single engined for police air support such Bell 206 and one leased AS350 with Mitsubishi logo to D & C.
There have been some exceptions with some public service ops electricity- with say the likes of the former short lived Schweizer 333 and Western Elec using Bell 206B
I knew the local French tv stations like RTE and RTL were using the likes of Helifrance with AS355 for the filming of Tour de France last year as they started in my neck of the woods but didnt see any Gendamarie AS350. Yes usually here its twin AS355 fro SKy or ITN or Beeb havent seen any single engined camera ships bar FlyingPixx R44. Yes there were Gendmarie outriders and vans escorting the cyclists but the only police helos I saw were the NPAS -in this case Suffolk force's EC135t2
Here are my photos from the event which started here in Cam (also on another thread below)
http://www.pprune.org/rotorheads/543...eng-ships.html
and said Gendamarie
Cheers