For the first half hour, it’s difficult to tell whether Sex Crimes Unit will have the momentum to make it through to the credits, and an impatient director might have shoved some glossy speed and bass-heavy beats into the proceedings. Fortunately, Lisa F. Jackson was wise enough to let her subject matter do the talking. The result is a documentary that is as without frills as its title. It is, in many ways, an anti-Law and Order: Special Victims Unit. The television show may be injected with drama, but this documentary is far more impactful. With effortless timing, it weaves together four separate stories – retelling the history of a 16-year-old sex crime that was solved because of DNA, following 2 cases in real time, and giving a little history of a division of the New York District Attorney’s office that was the first of its kind (yet is only 40 years old).