By that point, I think Foggy would step in and argue ALL the DNA test results that circle around Matt are all f**ked up and demand they get tossed out...all the while he is practically bum rushing Matt out the door..."Go dude! Just go! Don't look! Go!"

And I imagine Frank would catch wind of this whole fuster cluck and be like "Oops, I kinda accidentally blew up/set on fire/shot full of holes/destroyed that evidence...along with a lot of other stuff..."

Then Matt gets a stern lecture on not spreading his DNA everywhere (No. Not THAT way...)