The California Statute provides more protection than the Federal Statute. It is known as the Rosenthal Fair Debt Collection Practices Act and a very nice summary can be found here: http://www.dca.ca.gov/publications/legal_guides/dc_2.pdf
You can search the document to find what you want by hitting “Ctrl+F” and typing what you are looking for.
Questions about a debt collector calling a consumer at work? Search for the phrase “place of employment”.
Questions about a debt collector talking to consumer’s family members? Search for the word “family”.
Questions about a debt collector talking to the consumer’s employer? Search for the word “employer”.
Unlawful threats? Search for the word “threats”.
You get the idea.