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Possibly a false tip by someone with a grudge?

It's even possible that the tipster was somebody who tried to break into Frederick's house the week before.

Here are some details that are surfacing to date:

Frederick claims to have been defending his home, having had a break-in the previous week (and says the police told him they knew he had a break-in and knew who did it).
The warrant, based on information from an informant (it's looking a lot like the informant was the one who broke into Frederick's house), was for a large sophisticated marijuana grow operation in a detached garage. The police, after a very long delay and a second search, claim to have seized some lights and some marijuana (but no indication of seizing any quantity -- a sure sign that they only found some smokables).
Frederick is into gardening and landscaping and was growing both tomatoes and young Japanese Maple trees (which look like this).
Frederick has no record, and admits to being a recreational pot smoker and having a small amount (3 joints) in his home. This is in general supported by statements of family and neighbors.
Police say that they announced before their forced entrance. Neighbors never heard it.
The city manager today will apparently announce that the police department "will undergo a top-to-bottom examination including looking into procedures, policies and equipment used by the force."

My kid along with half the kids in America have smoked pot as I did when I was young. Does that give the cops an excuse to plow through your front door to search the place?
How about them doing L police work like going after the bankers that have been screwing folks with unfair mortgage practices? Nah, that would take some brains.