text: but jurisdictional elements are not the only elements a defendant need not know.under the default rule,ante,at,for interpreting public welfare offenses,courts have held that a defendant need not know that the substance he possesses is a narcotic,that the device he possesses is unregistered,or that he reentered the united states after previously being deported.see staples united states,citing united states balint,and united states freed,united states burwell,cadc united states giambro,united states.but surely the majority would not suggest that if we agree with those holdings regarding mens rea,we must then ignore the controlled substance element of the drug trafficking aggravated felony,the unregistered element of the unregistered firearms aggravated felony,or the following deportation element of the illegal reentry aggravated felony.see a b,e iii,m i,o.so there is likewise no reason to believe that the default rule for assigning mens rea to jurisdictional elements is embedded in the ina.