Dial+M+for+Murder+JCD

Compared with what we read How do the detectives approach the crime scene? What techniques for solving the crime are available? (ex. DNA, Fingerprint) How is the crime solved?

1) The detectives don't approach with the same type of care that the CSI people do. They touch some things but still aren't wanting to mess up the crime scene. There aren't pictures of everything and some things are moved around. The detectives use only deductive reasoning so they don't really worry about moving the body or anything. 2) Fingerprinting is available. That is why the man in the beginning wipes fingerprints off the drinks but leaves them on the letter for blackmail. 3) The crime is mainly solved using deductive reasoning. If everything goes according to their plan then the husband will prove his own guilt. If he doesn't go to the key then the detectives have proved nothing. Their guesswork and reasoning ends up working out because the husband does exactly what they speculate he will do.