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Plastic bag bans may be giving shoplifters a hand.

A Long Beach police sergeant says since the city's ban in 2011, it has sometimes been harder for shops to spot someone stealing stuff. He says stolen goods can be easily hidden in re-usable bags.

Some businesses in Los Angeles say theft has doubled since the city's plastic bag ban went into effect this year.

In Seattle, one-in-five surveyed shops say shoplifting has increased since Seattle's ban in 2012. 

--Jo Kwon