This was in the article,
Heather's father, Terry Elvis, has been at the center of a massive search effort both on foot and on social media. However, those efforts have not always gotten the blessing of the Horry County Police detectives investigating the case.
Regardless if they are involved, the actions would never be condoned by LE. I would hope and I believe that they have done something, as harassment reports have been filed. What I have read with my eyes, has caused tears and me to be sick, regardless if they are guilty. We don't know if they have been cooperating. We know from LE that SM was interviewed and from TE that he is not cooperating. IF LE has enough to bring him in for more questioning, he will need to do so with his lawyer. So, i am not buying the not cooperating bit. The polygraph thing is just silly. They don't hold up in court and many who don't know him, say he is a psycho, so he can pass while lying. If they have enough circumstantial evidence they may have got warrants to search his property, phones, etc... We don't know. To say otherwise is rumor.