Here’s a great place to start, and you can follow links at the end to even more:

https://www.cdc.gov/hiv/policies/law/states/exposure.html

Also, if you have the stomach for a lot of emotionally over-charged codswallop, you can Google “California decriminalizes HIV.” But much of what you’ll get won’t be very accurate. Conservative politicians tried to use California’s updated laws as a wedge issue.