Re: NRA-LE Precision Rifle Instructor Course.
NRA Instructor courses are about course content, with a heavy enphasis on safety factors, and methods of instruction. Can't speak about LE courses, but that's what the basic rifle and handgun instructor courses are designed to do.
Once this groundwork is undertaken and mastered, I believe it becomes a matter of attaining the specialized skills and using the instructor course methodology to construct and administer an expanded and/or specialized curriculum.
As for suitibility, I'm really not qualified to suggest the specific directions an LE Precision Rifle Instructor's Course should take, but unless the instructor has the genuine relevent experience, I wouldn't put much credence into such a course.
Greg