DETROIT - Registered nurses (RNs) failed to produce evidence of an agreement among eight Detroit-area hospitals to fix the compensation of RNs sufficient to defeat the hospitals' motions for summary judgment on the RNs' conspiracy claims, but the RNs did produce sufficient evidence to establish anti-competitive effects resulting from the exchange of compensation-related information among the hospitals in violation of federal antitrust law, a federal judge in Michigan ruled March 22 (Pat Cason-Merenda, et al. v. Detroit Medical Center, No. 06-15601, E.D. Mich.; 2012 U.S. Dist. LEXIS 38810).