Interception and detention of goods in transit under GST: document verification, release, and confiscation procedures explained. Procedure for interception of conveyances carrying goods in movement under the GST framework requires an authorised proper officer to verify documents and e-way bill particulars, permit movement where no discrepancy is found, and conduct detention and physical verification where prescribed documents are not produced. The instructions set out the forms, time limits, release mechanism, payment through the electronic liability register, and the use of bond and bank guarantee where release is sought on security. They also explain when minor errors in the invoice or e-way bill may not lead to proceedings under section 129, and when confiscation proceedings under section 130 may be initiated.