Congrats on making the decision to take action! Protest signs need to be simple. Just a few words. Perhaps "Informed Consent" or "Say No to Medical Tyranny" or "The Ferrets Died".

Is it in your budget to print what you posted as hand outs/flyers? That might be more effective.

Thank you for taking action. If you can just get one person to change their mind then your effort is worth it. Good luck!