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Postal Explorer > Publication 52 - Hazardous, Restricted, and Perishable Mail > 4 Restricted Matter 4 Restricted Matter 4 Restricted Matter 41 General 411 Definition 412 Mailer Responsibility 413 Rulings 414 Nonmailable Matter Found in the Mails 42 Intoxicating Liquors 421 Definition 422 Mailability 422.1 Nonmailable Matter 422.2 Mailable Liquors 423 Packaging and Marking 423.1 General 423.2 Denatured Flammable or Combustible Liquor 43 Firearms 431 Definitions 431.1 Firearm 431.2 Handgun 431.3 Antique Firearm 431.4 Rifles and Shotguns 431.5 Licensed Manufacturer or Licensed Dealer 432 Mailability 432.1 General 432.2 PS Form 1508 432.3 Packaging and Marking 433 Mailer Responsibility 434 Legal Opinions on Mailing Firearms 435 Nonmailable Firearms Found in the Mails 44 Knives and Sharp Instruments 441 Definitions 441.1 General 441.2 Switchblade Knife 442 Mailability 443 Packaging and Marking 443.1 General 443.2 Marking 444 Nonmailable Knives in the Mails 45 Liquids, Powders, and Odor–Producing Materials 451 Definitions 452 Mailability 452.1 Restrictions 452.2 Cremated Remains 453 Packaging and Marking 46 Motor Vehicle Master Keys and Locksmithing Devices 461 Definitions 461.1 Motor Vehicle Master Keys 461.2 Locksmithing Devices 462 Mailability 463 Packaging and Marking 464 Nonmailable Matter Found in the Mails 47 Controlled Substances and Drugs 471 Definitions 471.1 Controlled Substances 471.2 Drugs 471.3 Drug Paraphernalia 472 Mailer Responsibility 473 Mailability 473.1 Controlled Substances 473.2 Drugs (Other Than Controlled Substances) 473.3 Poisonous Drugs and Medicines 473.4 Small Amounts for Law Enforcement Purposes 473.5 Drug Paraphernalia 473.6 Return of Prescription Drugs 474 Packaging and Marking 475 Rulings 476 Nonmailable Matter Found in the Mails 477 Undeliverable Medicines 48 Unsolicited Promotional Samples 481 Definition 482 Mailability 482.1 General 482.2 Nonmailable Promotional Samples 483 Customer Objection to Unsolicited Matter 484 Rulings 49 Animal-Fighting Ventures 491 Definitions 491.1 Animal 491.2 Animal-Fighting Accessory 491.3 Animal-Fighting Matter 492 Mailability