Regarding The power of the Sheriff:
This article is a lot more extensive but it includes a great description of what being the Sheriff actually means. So for Baby Deoors case, no matter what a PI might states HE has planned, if its not scantioned by the county Sheriff it doesnt mean much more then a suggestion or a request to be allowed to proceed.
http://constitutionallawenforcementassoc.blogspot.com/
"The office of sheriff has a long and noble history. It dates back over a thousand years and originated in England. The sheriff is the only elected law enforcement official in America. He is the last line of defense for his citizens. He is the people's protector. He is the keeper of the peace, he is the guardian of liberty and the protector of rights. A vast majority of sheriffs will agree with all of this until they are asked to apply these principles of protection to federal criminals. Their backpeddling and excuses will be more plentiful than radar tickets and louder than sirens at doughnut time. Most of the unbelievers, who themselves have taken a solemn oath to "uphold and defend" the U S Constitution, will passionately and even apologetically exclaim that they have no authority or jurisdiction to tell federal agents to do anything, let alone stop them from victimizing local citizens. The truth and stark reality is that it's just the opposite;
the sheriff has ultimate authority and law enforcement power within his jurisdiction. He is to protect and defend his citizens from all enemies, both "foreign and domestic."