You must have an indoor garden? Unless you have very clear evidence of someone else’s involvement in “tipping the police off” I would say there are others things that could have resulted in this search. Such as buying anything from a hydroponic shop to grow tomatoes inside. An increase in your electric bill from running the system. A thermal heat signature that shows the pattern of “grow lights”. Such are the fruits of the war on (some) drugs.
I use three workbench lights from Home Depot to grow my seedlings (which are planted in Spring)...that is why I have been warning people about 'grow lights' on the garden thread...apparently they are now considered 'probable cause'.
Too late for us...only by the grace of Jehovah that we weren't gunned down in our own home. Everyone else? Keep an eye out.