substantively alter 12(e). See Fed. R.Crim.P. 12 advisory committee's notes, 2014 amendments (“New paragraph 12(c)(3) retains the existing standard for untimely claims. The party seeking relief must show 'good cause’ for failure to raise a claim by the deadline, a flexible standard that requires consideration of all interests in the particular case.”). 3 . Although the Government affirmatively.asserted waiver both in its response brief and during oral argument, McCoy declined to explain his failure to raise a mistake-of-law argument below. 4 . Moreover, McCoy’s mistake-of-law argument necessarily fails to the extent it relies upon circuit precedent that is at odds with the Supreme Court's recent decision in Heien v. North Carolina, — U.S. -, 135 S.Ct. 530, 536, 190 L.Ed.2d 475 (2014) (<HOLDING>). 5 .The district court made a few very minor
holding that a traffic stop is valid under the fourth amendment if the stop is based on an observed traffic violation or if the police officer has reasonable articulable suspicion that a traffic or equipment violation has occurred or is occurring holding that an officers reasonable mistake of law can give rise to the reasonable suspicion necessary to justify a traffic stop under the fourth amendment holding that a tip may provide the reasonable suspicion necessary to justify an investigatory stop holding that an officer has reasonable suspicion to conduct traffic stop even when his suspicion that a law has been violated is based on a reasonable mistake of law holding that a traffic stop is reasonable under the fourth amendment when police have probable cause to believe a traffic infraction has occurred