<i>...the case was ... dismissed ... based on a</i> retroactive <i>grant of immunity by Congress for telecommunications companies that cooperated with the government.</i><p>I thought <i>ex post facto</i> laws were expressly forbidden by the Constitution (minus certain exceptions [1] that have arisen in case law over the years). Did it work in this case because it was a civil instead of criminal matter?<p>[1] <a href="https://en.m.wikipedia.org/wiki/Ex_post_facto_law#United_States" rel="nofollow">https://en.m.wikipedia.org/wiki/Ex_post_facto_law#United_Sta...</a>