TMZ has learned the investigation into Jesse James' recent run-in with a paparazzo has been put on hold because cops haven't been able to speak to Jesse since he's been in rehab ... this according to sources close to the case.
As TMZ first reported, James and a photog placed each other under citizen's arrest during a confrontation on March 25. The paparazzo accused James of vandalism; James countered with accusations of stalking.
But a law enforcement source tells us the investigation is at a dead end until cops can speak to James.
The Long Beach PD confirmed the case was on hold but would not comment as to why.