I hope you have very good insurance because this is an accident waiting to happen...and that is definitely not hyperbole.
I don't know what kind of training your dog is getting but if he is growling at people who are not a threat then he shouldn't be getting that kind of training. A clear-headed, confident gsd will naturally protect her/his people when a threat is present. If your dog is perceiving all people as a potential threat then he is neither clear-headed nor confident. If this were so then working police and border patrol dogs would be unsafe around the general public.
It doesn't matter what type of clothing you wear or sign you put on him. If he bites someone, you will be held liable.
Ruth & the 4 Legged Rescue Gang
Rafi the malaroo
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Gio & Varda, the krazy kittens
....In my heart: