From the reading I've done this is a gray area, but would really appreciate input. Have a job where a person installed several hundred feet of RMC and utilized (not sure why) at several locations short nipples in the middle of his runs. In some places within a 10lf distance he has installed coupling/ factory 90/ coupling/ nipple/ coupling/ nipple/ coupling/ full stick/ coupling/ nipple/ coupling etc. Nipples very from 4"-12". Should I or better yet can I reject the work under poor workmanship? Requirements basically state comply w/ applicable NEC. Again I appreciate any responses.