--- type: restriction id: usps-toxic-substances-with-ld50-oral-toxicity-greater-than-5-mg-kg-but-no-more-than-5 asset: shipping-restrictions-by-class title: "Toxic substances with LD50 oral toxicity greater than 5 mg/kg but no more than 50 mg/kg — Postal shipping restrictions by item category" sources: - https://pe.usps.com/text/pub52/pub52c3_025.htm source_quote: "Toxic Substances with LD 50 Oral Toxicity of 50 mg/kg or Less: Division 6.1 toxic substances having LD 50 for oral toxicity greater than 5 mg/kg but less than or equal to 50 mg/kg are mailable only when sent between authorized parties under specified conditions" generated: true harvested: 2026-08-04 stale_after: 2027-08-04 item_category: "Toxic substances with LD50 oral toxicity greater than 5 mg/kg but no more than 50 mg/kg" carrier: "USPS" restriction_type: "restricted" scope: "domestic mail" conditions: "Mailable only when sent between authorized parties (manufacturers, dealers, bona fide research labs, or government employees for official use); for domestic air a Shipper's Declaration for Dangerous Goods is required" verified: true unverified_fields: carrier, conditions, scope --- **Item category:** Toxic substances with LD50 oral toxicity greater than 5 mg/kg but no more than 50 mg/kg **Carrier:** USPS **Restriction type:** restricted **Scope:** domestic mail **Conditions:** Mailable only when sent between authorized parties (manufacturers, dealers, bona fide research labs, or government employees for official use); for domestic air a Shipper's Declaration for Dangerous Goods is required > Toxic Substances with LD 50 Oral Toxicity of 50 mg/kg or Less: Division 6.1 toxic substances having LD 50 for oral toxicity greater than 5 mg/kg but less than or equal to 50 mg/kg are mailable only when sent between authorized parties under specified conditions Source: