My question involves police conduct in the State of: MI

Can police omit relevant evidence from the police reports that they send to prosecution for authorization? In other words, do prosecutors sometimes base their charging decisions on more evidence than was actually provided for the defendant or public record? I am specifically referring to a case that was dropped before trial, so the defendent never had the opportunity to receive discovery but he was charged based on what seemed to be very minimal evidence provided in the police report that he obtained a copy of.