There are many different types of evidence that can be used in a criminal investigation. Some more valuable than others. Although the smallest piece of evidence can sometimes turn out to be the most valuable. Evidence comes in all shapes, sizes and forms and are crucial to any successful investigation.
Finger prints are one of the most incriminating pieces of evidence. It is so significant because it can narrow down someone 's identity and possibly link them directly to a crime. Since no two people have the same fingerprint once a match is confirmed and linked to a person and crime scene it is almost impossible for the suspect to have any deniability of at a minimum being at the crime scene at some point.
Witness testimony is a great form of evidence. If there is an eye witness at the scene of a crime it can be extremely incriminating. Investigators must be cautious when relying on this for their case though. Although it can be a very incriminating piece of evidence it all comes down to the credibility of the eye witness.
When a fire arm is used in a crime scene there will sometimes be shell casings, gun powder residue, gunshots, bullets or other signs of ballistics. Even the smallest of amount of gunshot can often times be traced back to a specific firearm. This helps investigators link a weapon used in a crime or multiple crimes to an individual person.
Videotapes or photographs are always useful in any investigation. Most videotapes will come with a time stamp specially on security cameras. This will without a doubt put and individual at a certain location without having any doubts. One down side to this can be the quality of the picture or audio. Sometimes you will not always be able to obtain a perfect match.
The basement window in the Ramsey house has been the stir of much controversy. There seems to be contradicting evidence that forceful entry was used on the basement window. There was a shard of glass found on the window sill
References: Bardesly, Bellamy, Murder of JonBenet Ramsey; http://www.crimelibrary.com/notorious_murders/famous/ramsey/it_5b.html Unknown Author, 10 Most Incriminating Types Evidence; http://www.criminaljusticedegreesguide.com/features/10-most-incriminating-types-of-evidence.html