A U.S. federal appellate court judge upheld a previous ruling that advertising technology company NaviStone’s tracking tools violated a Pennsylvania state wiretapping law, MediaPost reports. The ruling now clears way for a Pennsylvania resident’s lawsuit against NaviStone and a retailer for using “technology that allegedly enables online retailers to arrange to send postal mail to ‘anonymous’ web users after they visit a website.” With the ruling, the case is now remanded to the U.S. district court for the Western District of Pennsylvania to decide if the plaintiff originally consented to the retailer’s privacy notice.