My dad told me a story growing up about one of his best friends getting arrested for doing this exact thing

That was back in the 70s.
My biggest concerns would be Karen's with cell phones, and security cameras. How many other people have noticed it and are now watching it?
I agree with Wizz, chucking an illegal substance into someone's yard unbeknownst to them is a little shady. Imagine getting arrested for something you had absolutely no knowledge of.