Most rehabs recommend, and most people follow, that anyone entering rehab goes to one that is a significant distance away from where they live, either in another state or in another country.
The logic behind this is that rehab is something of a bubble for a period of time, and it is better for the client / patient to be in this bubble away from their normal environment, home, family, work etc.
As a rehab is a clinical facility, and should oversee any medical detox and therapeutic work that needs doing, it is crucially important that you check the local accreditation and licensing requirements for where the rehab is located, and make sure the rehab fully complies.
This is a state by state list in the US where these requirements can be checked
Alabama
Alaska
Arizona
Arkansas
California
Colorado
Columbia ( District)
Connecticut
Delaware
Florida
Georgia
Hawaii
Idaho
Illinois
Indiana
Iowa
Kansas
Kentucky
Louissiana
Maine
Maryland
Massachusetts
Michigan
Minesota
Mississippi
Missouri
Montana
Nebraska
Nevada
New Hampshire
New Jersey
New Mexico
New York
North Carolina
North Dakota
Ohio
Oklahoma
Oregon
Pennsylvania
Rhode Island
South Carolina
South Dakota
Tennessee
Texas
Utah
Vermont
Virginia
Washington
West Virginia
Wisconsin
Wyoming