Steven Gruel has long contended that the feds were out to get his client, the celebrity private eye Anthony Pellicano, well before they executed a 2003 search warrant that resulted in Pellicano’s conviction on explosives charges — and a protracted federal investigation aimed at some of Hollywood’s biggest lawyers.

In court papers filed late Tuesday, Gruel, a former San Francisco federal prosecutor, gave the most detailed peek yet into how he plans to support that claim. He also outlined his contention that prosecutors improperly used Pellicano’s girlfriend as an informant to pry into the detective’s defense strategy.