What happened?

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I went to a support group for my illness and this woman that is usually there (and had been pressing someone to give her a 1/2 lb. of weed) and she was giving out samples of the cannabis butter she made which she said did not come out quite right.

She said you can either rub it on yourself for pain or eat a 1/2 tsp. of it on a cracker.

I tried the cracker approach and wow, did it ever sicken me in the stomach. It was not refrigerated or anything at all. It looked odd to me and I'm wondering, does this cannabis butter go bad? It was probably a couple of weeks old when I got it and after the sick thing happened, I threw it away (good riddance!).

Please let me know if anyone has a clue. Thank you.