Court Leaves the Door Open For Safety System Wiretaps
Federal appeals court decision in November suggests that government may be able to convert sophisticated safety and communications systems now available in automobiles into roaming in-car wiretaps; unidentified company challenged series of court orders requiring it to create roving bug for FBI; appeals court overturned orders, but its reasoning suggests that issue will recur; technology involved, which is used by OnStar, ATX and others, combines global positioning satellite with cellular telephone; drivers can use services to seek information and emergency help; spokeswoman for OnStar says that her company is not involved in case and that OnStar's setup is not capable of what she calls 'stealth listening'; photo (M)