Are you talking about "48 hours" or "the first 48"? If it's "the first 48", then I agree it's absurd how they always confess without pressure. In an episode they even solved a contract killing in Las Vegas in a couple of hours because the middleman who found the hitman gave everybody up immediately after being asked the same question twice. He might as well have gone to the police himself even before the hit was done.

I can understand this happening after drunken riots or crimes of passion, but with organized/business related crime such behavior looks like a comedy movie.