THC is fat-soluble. One common method of extracting THC for use in edibles is to immerse the marijuana in melted butter and then use the THC-infused butter to cook/prepare the edibles. I discovered this when I had bad complications after gallbladder removal - my pancreas got infected & necrotic. Eating too much fat would cause an acute attack of pancreatitis. For comparison, people who have had pancreatitis, kidney stones <i>and</i> given birth vaginally report that pancreatitis is the worst of the 3. By trial and error (namely repeated hospitalizations), I discovered that the maximum amount of fat I could tolerate at a meal was 7 grams of fat. This is about 1 pat of butter. Or half of a White Castle slider. Then, 12 hours later, I could safely eat the other half of the slider. I had gotten a medical marijuana card in Colorado by that time.<p>Milk contains fat, therefore the fat content of milk will be absorbing and extracting THC that enters the bloodstream of the cow.<p>For treatment of chronic pain after that surgery-gone-wrong, I have to get my pain meds from a pain clinic. At least 3 times per year, I have to take a urinalysis drug-screen to ensure that:<p>0. I'm taking my meds and not selling them, and<p>1. I'm not taking other drugs like THC, meth (my state's #1 illegal drug of choice!) or whatever is popular these days.<p>Anti-nausea meds like Zofran & Reglan metabolize into something that standard drug screens think is THC. I almost got kicked from the program because of this.<p>I bet that if I walked past a drug-sniffing police-dog that it would have either a seizure or an orgasm.