This is correct. Several years ago while a buddy of mine was flying a 40% aerobatic airplane a Cessna 180 came over our field from behind and at approx 500'. My buddy immediately dropped down until the Cessna was a safe distance away and then he proceeded to continue his IMAC sequence. The Cessna soon returned and this time announced that he was a CHP patrol aircraft. Right after he landed and we walked the airplane into the pit area a couple of CHP cars showed up at the field and approached us. The air unit had informed them that we had broken the 400' altitude limit. This was back in 2007! No such limit at that time just the advisory. I tried to explain that to the officers but they were not having it and threatened to site us.

That being said, I feel this was a fairly unique situation. Local law enforcement is only going to respond to complaints. The odds of someone calling in a complaint for someone flying a model airplane is pretty small IMO, even smaller if flying at a club site. Then the dispatcher will assign the call a low priority above other " crimes " being called in. The reality is back to being something that is rarely going to be enforced.