There’s a recipe in the March/April 2020 issue of Zymurgy magazine and here: https://www.homebrewersassociation.org/homebrew-recipe/thc-infused-caramel-amber-ale/
It comes with a disclaimer:
THC-infused beer can—and very likely will—induce psychoactive effects, which can vary from person to person. Consume these beers responsibly and at your own risk. If you are unsure of what to expect, start with a very small sample and wait a few hours before consuming more.
...and an Editor’s Note:
Despite legalization and/or decriminalization of cannabis and cannabis-derived products by many states and the District of Columbia, marijuana remains classified as a Schedule I substance under the Controlled Substances Act of 1970 and, thus, federally illegal. The American Homebrewers Association neither endorses nor discourages brewing with cannabis-related products, however homebrewers who do so should remember that such beers are not permitted in the National Homebrew Competition. Most local and regional competitions also do not allow cannabis beers at this time.
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