I understand the saying

But, it doesn't answer my question. Are LE jobs to "prove their case" or "solve the crime"...I should have worded it differently above. It's been mentioned more than once that a case can be built
for something, just as well as a case can be built
against something...and very likely there are research documents, etc. to prove both sides...my question is, what is it that LE and the Crown are after as far as a successful prosecution of a case...."proving their case", or "solving the crime"? As I said, they could very well be 2 different things. We've had many people in jail in Canada wrongly accused because a case could be built against them...and obviously proven to 90% probability of guilt...as they ended up incarcerated for years and years. Yes, I know that was before DNA testing...but DNA testing didn't make them innocent, it came out and proved them innocent...they were innocent to start with...they were "proven" guilty in a court of law...successfully convicted...until evidence came along many years later proving their innocence...so tell me, how did they go about proving their guilt when they weren't guilty in the first place? Would you want to be put in jail for 25 years, have your life ruined because LE or the Crown "proved their case", or would you prefer that LE "solved the crime"? Big, big difference.