"...If California is like most states (and I believe it is), a poker game is only illegal if the house is taking a rake off the top. In this case, it looks like that "rake" was the $5 the extra the hosts asked from each buy-in to pay for pizza and beer.
Police also took a 13-year-old girl out of the home, away from her parents, and turned her over to child protective services. In addition to the charge of running an illegal gambling operation, the hosts are also charged with contributing to the delinquency of a minor. Good thing the poor girl was saved before slouching toward an inevitable life of crime..."
... and a first-hand account here.