Chanel Lewis — the man serving a life sentence for the murder of Queens jogger Karina Vetrano — should have his conviction overturned because cops used an unfair “racial dragnet” targeting black men before landing on him as their prime suspect, his attorneys argued in new court papers. Prosecutors allegedly failed to disclose the use of the so-called dragnet — in which the NYPD conducted DNA testing on “hundreds of black men” — before arresting Lewis, now 27, in the high-profile 2016 slaying, according to the documents filed Monday. Detectives used the controversial testing method all because Parabon Nanolabs —...