If they surveil you without your knowledge, you don't know. They're just one step ahead of you. They can gaslight you. Know where you're about to be and leave something there for you to trip over.
Or they can just evaluate whether you're too much of an inconvenience and then arrest you -- Three Felonies a Day and all that, easy to find when you're spying, and then parallel construction and you're out of the way.