Dealing With the Police:
Witches should be aware that in reporting a crime they may have to spend time explaining their religion to the responding officer. Harassment is harassment and discrimination is discrimination regardless of the victim's religion. A satisfactory resolution to the problem is what you are after. By taking time to explain Wicca, if necessary, you are more apt to achieve that resolution.
The same may be said of violent crime. If you are injured, the attitude, "you got what you deserved" might be the opinion of the responding officer.
Should there be property damage or theft, be prepared to patiently explain each item and to stress the fact that your athame is NOT used in sacrificing anything. This may sound ridiculous. To most non Craft members a knife is a knife. An athame does not look like a butter knife.
What if your department is anti-Wiccan or Pagan? Here we have a genuine problem with, unfortunately, no single solution.
Should you be subject to harassment, there are steps that can be taken. Information concerning your rights is available on Witchvox. Wicca is a recognized religion. As such it is protected under the First Amendment.