http://www.stltoday.com/stltoday/bu...6D6BB2D0109504848625738000092CEB?OpenDocument Shanahan says he didn't know he was doing anything illegal By Tim Logan ST. LOUIS POST-DISPATCH 10/26/2007 Call it the "we didn't know it was illegal" defense. Attorneys for former Engineered Support Systems Inc. Chief Executive Michael Shanahan Sr. asked a federal judge Wednesday to throw out the 12 criminal charges he and others face related to stock-option backdating, arguing the laws on the practice were "unconstitutionally vague," and shouldn't be used in criminal cases...