Misconduct by customs officers triggers prosecution under Section 136 for collusion, vexatious searches and unauthorised disclosure. Prosecution under Section 136 applies where a customs officer colludes in or permits fraudulent export or duty evasion, or acquiesces in such agreements, attracting imprisonment, fine, or both. Separate offences cover vexatious searches or arrests-requiring searches, arrests, or authorising searches without reasonable belief in seizable goods, documents, or offences-and unauthorised disclosure of particulars learned in official capacity, each carrying prescribed criminal penalties.