蒙混过关；If something slips through a set of checks or rules, it is accepted when in fact it should not be. [V P n] [V P]
//…hardened troublemakers who have slipped through the security checks…
那些混过了安检的难缠的闹事者
The slightest little bit of inattention can let something slip through.
稍不留神就会让某些东西蒙混过关。