Surveillance video shows Thorne dressed in his police gear that included a bulletproof vest, hat, full uniform, a gun and even a police badge.
But what the hotel staff didn’t know at the time was that this 22-year-old, who is now under arrest and charged with multiple felonies, wasn’t there to conduct an investigation.
Instead, Cobb County police say, he was there to commit an armed robbery.
The holdup happened inside a hotel room where two guests were forced to hand over $800 in cash and an iPhone valued at $700.
Cobb police worked the case for days and through the help of APD, they identified Thorne as their suspect.
Cobb police will only say this is an ongoing investigation
WSB-TV looked into Thorne's record and learned he joined APD in 2017, working as a patrol officer on the city's southeast side until earlier this year.
In a statement, an APD spokesman said:
"APD’s Office of Professional Standards was investigating then-Officer Justin Thorne after receiving an allegation in late September that Thorne had offered to take payment from a suspect with an outstanding warrant in exchange for making the warrant go away. When Thorne was asked by OPS to make a statement about the allegation, he chose to abruptly resign on October 1."
WSB-TV contacted Cobb County police in an attempt to learn more about the circumstances surrounding this armed robbery.
Cobb police declined to comment, citing the ongoing investigation.
WSB-TV confirmed the two victims are from Arkansas and were not seriously injured during the incident.