Letter mail clearance: automated scanning generally releases items, but suspected contraband or dutiable goods prompt further postal examination. Clearance of Letter Mail Articles is effected primarily by Customs through elimination by automated scanning at presentation; items without indicia of non-compliance are released. If scanning or presentation suggests contraband or dutiable goods, the article is diverted from routine clearance and subjected to further physical examination at the relevant Foreign Post Office or sub Foreign Post Office to assess admissibility and applicable customs measures.