There is a case that is 30+ year old where I developed the majority of evidence that was later confirmed by an independent method. Every time I try and dig into it, I get visits and messages from individuals who are clearly undercover investigators from the DA's office or LE. It seems to have stopped since Cold Case Chronicles did a podcast on the case. Like I said, even if you have a critical skill set and an intense desire to solve a case, if you start digging, you get unwarranted attention. The cover story of "It still an open investigation and we can't discuss it" only goes so far before it starts to look like "we don't have any idea what happened and we don't want you to solve it and make us look bad".