http://www.retailonlineintegration.com/article/the-zip-code-collection-debate-retailers-continues/1
As of last week, two states have now declared that asking
for customers’ ZIP codes in-store at the point of sale violates their privacy
laws.
Court Ruling on ZIP Codes Challenges Retailers
The
Massachusetts Supreme Judicial Court ruled last week that retailers
that record customers’ ZIP codes when they make credit card transactions can be
sued under Massachusetts consumer privacy law because they're retaining
personal
identification information. California's Supreme
Court made a similar
ruling in 2011.