---
type: restriction
id: usps-controlled-substances-schedule-i-v
asset: shipping-restrictions-by-class
title: "controlled substances - Schedule I-V — Postal shipping restrictions by item category"
sources:
  - https://pe.usps.com/text/pub52/pub52c4_020.htm
source_quote: "the mailing of the substance is also unlawful under 18 U.S.C. § 1716."
generated: true
harvested: 2026-08-04
stale_after: 2027-08-04
item_category: "controlled substances - Schedule I-V"
carrier: "USPS"
restriction_type: "prohibited"
scope: "all mail - when distribution is unlawful"
conditions: "If the distribution of a controlled substance is unlawful under 21 U.S.C. Section 801-971 or implementing regulations, mailing is also unlawful under 18 U.S.C. Section 1716"
verified: false
unverified_fields: carrier, conditions, item_category
---
**Item category:** controlled substances - Schedule I-V

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** all mail - when distribution is unlawful

**Conditions:** If the distribution of a controlled substance is unlawful under 21 U.S.C. Section 801-971 or implementing regulations, mailing is also unlawful under 18 U.S.C. Section 1716

> the mailing of the substance is also unlawful under 18 U.S.C. § 1716.

Source: <https://pe.usps.com/text/pub52/pub52c4_020.htm>