If the cops ever get a hold of Matt's DNA in this scenario, that's basically the end of his secret identity.
The cops collect DNA from a crime scene, and any which they can't match to a specific person gets labelled "Unknown Source" and then assigned a serial number or something, something like "Unknown Source 123". Next crime scene, they find a bunch of DNA, put it all in the database, and what do you know, "Unknown Source 123" was here, too. Next crime scene, same thing. It wouldn't take many crime scenes to realize that only one person has been spotted at or near all these crime scenes - Daredevil. So eventually, they would figure out that okay, "Unknown Source 123" is Daredevil.
Then, somehow, the cops get a hold of Matt's DNA. I doubt that he would let them take it willingly, but they may very well have a warrant for it or something and can make him give them some.
If Matt is Unknown Source 123, then he is Daredevil.
And it wouldn't exactly be difficult to accuse Daredevil of having killed someone...
Re: Accused of Murder, post Season 2
The cops collect DNA from a crime scene, and any which they can't match to a specific person gets labelled "Unknown Source" and then assigned a serial number or something, something like "Unknown Source 123". Next crime scene, they find a bunch of DNA, put it all in the database, and what do you know, "Unknown Source 123" was here, too. Next crime scene, same thing. It wouldn't take many crime scenes to realize that only one person has been spotted at or near all these crime scenes - Daredevil. So eventually, they would figure out that okay, "Unknown Source 123" is Daredevil.
Then, somehow, the cops get a hold of Matt's DNA. I doubt that he would let them take it willingly, but they may very well have a warrant for it or something and can make him give them some.
If Matt is Unknown Source 123, then he is Daredevil.
And it wouldn't exactly be difficult to accuse Daredevil of having killed someone...