And those three credible independent eyewitnesses would easily be trumped by some actual evidence, wouldn't they?
For example, they all report seeing a bigfoot in a certain area at a certain time, but it turns out that there's a security camera in the area, and it shows something else in the area at the time, that obviously fooled them.
There go your eyewitnesses.
Too bad actual evidence of bigfoot is sorely lacking, huh?
First, I would make sure to check the area and view the video footage myself prior to interviewing witnesses.
Second, you are absolutely right when it comes to eye witness testimony. Many times when eyewitnesses get together they will greatly influence what the other person did or did not see. Sort of....filling in the blanks for that person.
I have learned through numerous interviews of eyewitnesses who have observed the same crime, that they usually view the crime happening in the same way, but they may interpret the act differently simply based on personality, etc. Ex. If someone is afraid of guns/knifes, they may distinctly remember seeing the gun/knife but can't tell you a thing about the persons appearance.
The second eye witness may be greatly offended by the use of foul language. They can't recall seeing a weapon but they remember hearing a loud deep man's voice shouting curse words and making threats prior to seeing the victim "hit the ground."
The third eyewitness may not be startled by cursing/violence, and they regularly shoot weapons or carry a knife. This eyewitness can often times simply cooberate what the other witnesses have said. Further adding that the suspect was a large white male wearing a denim jacket and having a beard and long dark hair.
Coincedentally, the suspect is a large white male, he has a very deep voice, he was carrying a black 9mm pistol and he was wearing a denim jacket when arrested. (Oh yeah, the guy can't get out two sentences w/o horrible cursing too.)
Each witness views the crime differently.......but exactly the same way.
To an unlearned investigator this would appear to be an unreliable eyewitness account. To a seasoned investigator, these people are credible, believable, and would make great witnesses before a jury in court. (If their eye witness accounts are presented with proper prespective to the jury hearing the case.)