I found this statement also interesting.
Regarding the naming of other people of interest, Kampfer said officials are following several leads, including two leads involving people. But, Kampfer said, identifying the other people whom investigators are looking into might result in
those people fleeing or tampering with evidence. He said fear of potential retribution against the family by those named is a concern, as is the possibility someone might do something to harm Hailey or destroy evidence if they knew police were focusing on them.
When naming Adkins as a suspect, Kampfer said, law enforcement was aware of the potential risks. Sometimes, he added, watching how someone responds psychologically to being named a suspect can be very telling, and potentially could lead investigators to new evidence.
Law enforcement officials searched all weekend in Scurry County, scouring abandoned buildings and eliminating a lot of suspicious areas, he said.
"Eliminating possible locations and possible suspects is a big part of what we do," Kampfer said.
http://m.reporternews.com/news/2011/jan/31/mother-missing-colorado-city-teen-provides-copy-ti/