it's the same as far as needing a probable cause for a crime to have been committed,No, the govt only needs probable cause to believe the attorney has information that is not privileged and more likely than not relevant to proving a crime.It only applies to a clients attorney if they can proof that a crime was committedThe Government is allowed to raid when they have a search warrant
It is in the fourth amendment
Your snowflake komrades keep telling us how there is a much higher standard for such warrants, but you just told us that the standard is the same as for any other warrant.
the processing of the information collection, specific to the warrant requests with probable cause, is handled differently, with protections keeping client/attorney privilege correspondences from the prosecutor's investigators.