Protocols for using firearms in movies are "very strict," veteran Hollywood armorer Guillaume Delouche says in an interview with AFP, adding that it is "preferable to keep as few people as possible on set when guns are being used." US actor Alec Baldwin killed cinematographer Halyna Hutchins when he discharged a gun on the set of the film "Rust," Joel Souza, the film’s director, said in a search-warrant affidavit. [COMPLETES VIDI9Q937A_EN] IMAGES AND SOUNDBITES