how do the police investigate crimes?
548622
When investigating they should find the answers to 4W's and H. Meaning When the crime happens?, Where it happens?, Who are the ones involve in the crime?, What causes?, and How it happens?.Answering this questions is the basic in investigating a crime.
985496
ask a judge or police officer to explain it.
17516
It depends on the department they work for, along with the job title and specifications. CSI isn't a nationwide title, and some forensic duties are carried out by police.
136636
Call the police department and they will help you track them down.
250256
I work for a police department and I answer this question every week several times. Yes you have to contact the Police in the town of which the crime occured.
86430
You would need to find out the policies of the specific police department.
133986
the FBI is involved with investigations of crimes.  Marshal Service tracks down fugitives, transports convicts, and provides security for the federal court system
825898
I don't know what state you live in, but when you file a complaint that is later investigated in most states the complainant can not be identified by the police, your friends are yanking your chain.  All the police do is send over an officer to measure the decible level, then they knock on the door and say they just measured the decible level and it exceeds the city's ordinance.  If they don't turn down the noise the by-law officer or the police officer then can file charges based on their measurement of the decible level alone.
301319
Ask them for it, or become a cop and make sure they do something so that you can get a warrant to look at it.
123877
The previous answer was good except "how" was forgotten. Also, the officers actions relating to the investigation and the disposition of the case.
175821
Local Police maybe, if you have evidence.
592047
Crime scene investigators are employed in all police departments and sheriff's offices.Talk to these law enforecement agencies for career opportunities. Some are under civil service, and some are not.
89192
You take it to your local police station.
22986
At your local police station.
566290
They are in charge of prosecuting federal crimes in the United States.\n\nRead the "Mission Statement"\n\nhttp://www.usdoj.gov/02organizations/
188005
First the police will use immediate personal affects to identify the victim, i.e. wallet, any mail found in the apartment (assuming that was the victim's home), confirmation from the neighbors as to who the person is.  Next step is to have family members try to ID the body, or what's left of it, using distinguishing characteristics (tattoos, etc.), then after that it's dental records.  \n\nThere are also a lot of investigative tactics that can be used to narrow down the possibilities of who the person COULD be, by talking to people and seeing who comes up missing, and figuring out which people on the missing persons list the corpse might be based on what is known.\n\nFingerprints and DNA are only good if that individual has positively ID'd fingerprints or blood/hair samples on record, which is often not the case.  Unfortunately (or fortunately, if you're an Orwellian), we don't have the capability of analyzing a DNA sample and having the person's name come up.  \n\nDNA analysis only works for creating matches, i.e. proving that the blood on the floor of the crime scene was actually the suspect's blood by comparing the two samples.  And while there is a pretty vast fingerprint database, normally fingerprinting is only good for establishing matches as well.
259245
Department of Social Services, and in the case of physical abuse... the police.