San Francisco’s annual 4/20 celebration is happening this week. For its part, San Francisco is trying to embrace the celebration this year.

As KCBS Radio's David Welch explains, there are some new ground rules.

 

San Francisco&rsquo;s annual 4/20 celebration is happening this week. For its part, San Francisco is trying to embrace the celebration this year.
As KCBS Radio's David Welch explains, there are some new ground rules.
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