The Soraya site has some interesting links. One is to safety advice about dealing with law enforcement.
http://www.autismriskmanagement.com/people.html

Persons with autism who are able to navigate the community without assistance should strongly consider developing a personal handout for the police. Remember that the initial uninformed contact with police presents the highest potential for a negative outcome.

Some suggestions to consider during sudden interactions with police:  
Do not attempt to flee  
Do not make sudden movements  
Try to remain calm  
Verbally let officer know you have autism. If nonverbal, use alternative communication tools, such as a simple sign language card, that indicates the need to write  
Obtain permission or signal intentions before reaching into a coat or pants pocket, or reaching into a car glove box    
If unable to answer questions, consider use of a generic or person-specific autism information card  
If you lose the ability to speak when under stress, consider wearing an alert bracelet or necklace that is easy to see--one that lets the reader know you have an information card  
Ask officer to contact an advocate, if necessary and possible  
For the best protection of all involved, the person with autism who has been arrested should, either verbally or through an information card, invoke the right to remain silent and ask to represented by an attorney  
If you are a victim or are reporting a crime, you do not need to have an attorney present to speak to the police, but you may want the police to contact a family member, advocate or friend who can help you through the interview process  
Carry the phone number of an advocacy organization or personal advocate, relative or friend.