Chicago's new pot law is about to take effect.  Beginning today, people caught with small amounts of marijuana will get 250-dollar tickets from police.  The city's council voted overwhelmingly in June to decriminalize possession of 15 grams or less of marijuana.  The ordinance supported by Mayor Rahm Emanuel calls for police to issue a written violation rather than make an arrest.  

Supporters of the measure say it will save money on law enforcement.  Figures from the mayor's office note that each small pot arrest involves four officers and places a burden on the courts and jails.  Seattle, Pittsburgh and Philadelphia are among other cities with similar policies.  The new law comes in the middle of Lollapalooza, the three-day music festival.     

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