California's flurry of cease-and-desist letters to 13 genetic testing companies (including 23andMe) has whipped the blogosphere into a frenzy. As GTO noted Monday, the sticking point is that the state governs genetic tests as medical services, and requires that a doctor be involved in ordering the test and dishing out the results.

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Direct-to-consumer genetic testing companies have offered to test families separated at the southern US border, but that raises ethical issues.

CNBC reports that confirming a positive result from 23andMe's BRCA health report can be expensive.

The New York Times reports on a project to develop a tree DNA database to uncover illegal logging.

In PLOS this week: links between gut microbiome and colorectal cancer mutations, targeted sequencing uncovers genetic susceptibilities to epilepsy in Koreans, and more.