The police never exhaustively investigated anyone but the Ramseys. They took blood, hair and handwriting samples from other suspects and they may have asked a few questions regarding alibi, etc, but these "investigations" were cursory, they were just going through the motions. Plenty of useful tips and leads were ignored and many very viable suspects were never investigated at all. They had made up their minds that the Ramseys were guilty and were clearly not prepared to invest too much time and effort investigating anyone else. Stephen Singular gives a good example in the following interview:<quoted text>
The Police interviewed almost 200 'suspects' in this case. Non testimonial evidence was collected from anyone who could have theoretically been involved. Even from a lunatic in Thailand.
Q: You were responsible for focusing Alex Hunter and his team on another suspect weren't you?
Yes, I told Hunter that a photographer (Randy Simons) who'd taken JonBenet's picture and who, according to some pageant moms in the Denver-Boulder area, had asked if he could photograph their girls nude or semi-nude, had freaked out following the murder and had acted very suspiciously ever since. I was not suggesting that Simons participated in the death of JonBenet but that he might well have knowledge of the kinds of activities and subculture I was telling Hunter about. At the time I told the DA this, he'd never heard of Simons, which indicates just how much the Boulder police resisted investigating the murder outside of the family and how little they knew about the world JonBenet had been exposed to through her pageant connections.
Q: What was the result of those investigations?
The police never truly investigated Simons or anyone else who raised the possibility of a different scenario for this homicide. They were, to use Hunter's word, "fixated" on the Ramseys and still are.
Q: So when police chief Mark Beckner told the press that his detectives had "intensively investigated" numerous other suspects, apart from the Ramseys, he wasn't telling the truth?
He was telling the truth as he saw it. They did devote a little time to this or that person but never with any conviction or genuine curiosity. From firsthand observations of the police behavior in this case, I can tell you that they have not deeply investigated a number of credible leads. They haven't acted this way out of malice, but because they hold only one view of the case. The murder can't be solved, I believe, because that view doesn't fit the evidence.