Patrick Kane -- 'Stolen' Rape Kit Was an 'Elaborate Hoax' ... Says Furious D.A.

The D.A. for the Patrick Kane rape investigation says the alleged victim's lawyer was flat out lying and creating a "circus" when he claimed the rape kit was stolen from police custody.

As TMZ Sports reported ... the lawyer for the alleged victim held a huge news conference to accuse someone of tampering with his client's rape kit, and thereby compromising the case.

Well, D.A. Frank Sedita III is now unloading on the attorney ... who said the rape kit was in a bag left at the victim's mother's house. Sedita blasted the whole story as false, and brought visuals as back up. You gotta see how he went off on a reporter who insinuated his office was somehow to blame.