UPDATE: Kudos and thanks to poster bonniemreese, along with the parents of the loved one and the Battle Creek police dept. The loved got out of Best Drug Rehabilitation Center's Tranquility Detox in Battle Creek, MI
in Manistee, MI and finally made it home. Getting him home was quite a feat and big amount of juggling, despite BDR's attempts to get him to stay.
More details to follow in the future.
I edited above to reflect my previous update, now edited