Moments after Luigi Mangione was handcuffed at a Pennsylvania McDonald’s, a police officer searching his backpack found a loaded gun magazine wrapped in a pair of underwear.
The discovery, recounted in court Monday as Mangione fights to keep evidence out of his New York murder case, convinced police in Altoona, Pennsylvania, that he was the man wanted in the killing of UnitedHealthcare CEO Brian Thompson in Manhattan five days earlier.


My hunch is that the shooter, whoever it was, dumped the gun, silencer, and manifesto somewhere and the cops found it. When they decided they had the shooter in custody, they ‘found’ the evidence in his possession.
Doubtful, the manifesto was full of cop dicksucking and tied off any possible loose ends perfectly.
It was a cops fanfic manifesto they are claiming is legit.