Can't you just plead the fifth?? Just say you want to see your lawyer! You won't get caught, the detective can't do anything, nobody knows you did it, END OF MOVIE. Instead, in this kind of movie, the killer ALWAYS confesses everything at the end instead of doing what is always done since the beginning of time: just say, "Talk to my lawyer, please!"
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Lol, I know. This reminded me a little too much of Murder She Wrote when Jessica accuses someone of murder because they misspoke and they immediately start to confess and tell their life story.
shareLOL, I found that kinda hilarious the way it played out at the end but the fun of a film like this is not in catching the murderer but the journey itself, thanks to the main characters who have a lot of charm, wit and charismatic interaction.
shareA couple of exceptions I can think of that avoid the "magical confession" cliché are David Fincher's Zodiac and Clint Eastwood's Changeling. These two are fact-based dramas, so they have stick to what really occurred in the real-life events on which they were based: no confessions.
The early 90s TV series Homicide has an early episode that shows an interrogation in its entirety, with two detectives trying to break down a suspect to obtain a confession; but the suspect never confesses. When I first saw it I thought it was refreshing, because we so often saw otherwise.