Then on Thursday, around 1:00 in the afternoon, nearly two weeks after Teeky had disappeared, the dog on the boat went into "alert" mode and shortly thereafter a body surfaced in the river, right alongside the four-man crew. They called Miller, who was on a bridge a mile away with a county investigator, and they sent for the sheriff and medical examiner. When the remains were identified as those of the missing girl, the team felt a grim sense of triumph: Their determination had paid off, but little Teeky had clearly been murdered. The autopsy indicated that she had been beaten with a blunt instrument and stabbed with a knife.
http://www.trutv.com/library/crime/criminal_mind/forensics/texas_equusearch/2.html
SS - I think the article clearly stands for the proposition that TES will continue searching for a missing person despite LE pulling out of the search and having a suspect...
see below:
"Yet Carrington, 31, was not talking, and a week after Teeky had disappeared, she still had not been found. Local law enforcement made the difficult decision to pull their officers off the search, including Texas Rangers who had joined, because their resources were required elsewhere. Miller's team sought more volunteers to continue the search on their own."
http://www.trutv.com/library/crime/criminal_mind/forensics/texas_equusearch/1.html
It was only after LE, who was dealing with volatile suspects that may have murdered Teeky, pulled out & TES continued to search on its own that Teeky was found, and LE didnt pull out b/c they thought Teeky was deceased - they simply didn't have resources to continue.