CO: Warrant for taxpreparer for customers using false SSNs violated Fourth Amendment

From the Immigration Professors Blog: Judge Rules Search of Immigrants’ Tax Returns Violated 4th Amendment. A Colorado District Judge has held that investigators illegally rooted through over 5,000 client files at a tax preparation firm looking for evidence of immigrants using false social security numbers. People v. State of Colorado, No. 08CR2087 (D.C. Weld County, Mar. 7, 2009). The Fourth Amendment discussion starts at page 12 of the slip opinion. The court even likens this search to a writ of assistance.