(CNN) -- Federal prosecutors in California announced a series of actions Friday targeting what they characterized as the "large, for-profit marijuana industry" that has developed since the state legalized medical marijuana for select patients 15 years ago. Four U.S. attorneys -- Benjamin Wanger, Andre Birotte Jr., Laura Duffy and Melinda Haag -- detailed in a joint press release and later press conference in Sacramento some steps that have been taken in conjunction with federal law enforcement and local officials in California. They include letters of warning to landlords and lien holders of places in which marijuana is being sold illegally, "civil forfeiture lawsuits against properties involved in drug trafficking activity" and numerous criminal cases. The latter refers to arrests in recent weeks related to cases filed in federal courts in Los Angeles, San Diego, Sacramento and Fresno, all part of an effort that Wagner claimed has resulted in the seizure of hundreds of pounds of marijuana, tens of thousands of plants and hundreds of thousands in cash.
@highlight
NEW: A U.S. attorney says some take "advantage of (a) laxed enforcement environment"
@highlight
NEW: Another U.S. attorney claims "profiteers" "hijacked" the state's medical marijuana law
@highlight
An advocate says there's a "terrific disconnect" between the feds and public on marijuana
@highlight
Steps taken in recent weeks include civil forfeiture lawsuits, warning letters and arrests
@placeholder claimed that people, "often with criminal records, are coming to California to set up marijuana operations taking advantage of the lax enforcement environment in this state."