657—12.6 (124B) Identification of purchaser or other recipient. Prior to selling, transferring, or otherwise furnishing in this state any precursor substance as defined in rule 657—12.1(124B), a vendor shall require appropriate identification of any purchaser or other recipient. Letters and other documentation required by this rule shall be maintained for two years following delivery.
	 12.6(1) Face-to-face transactions. Prior to furnishing any precursor substance in any face-to-face transaction, a vendor shall require and document all of the following:
	  a.   	 A valid driver’s license or other state-issued identification issued to the purchaser’s representative. The identification shall contain the photograph and residential or mailing address, other than a post office box number, of the purchaser’s representative.
	  b.   	 The motor vehicle license number of the vehicle owned or operated by the purchaser or the purchaser’s representative.
	  c.   	 A letter of authorization from the purchaser. The letter shall include the purchaser’s business license number and business address, a description that identifies how the substance will be used, the name of the purchaser’s representative authorized to receive the substance, and the purchaser’s signature. The purchaser’s representative shall also sign the letter in the presence of the vendor and the vendor shall sign as a witness to the identification and signature of the purchaser’s representative.
	 12.6(2) Furnishing to a person via transaction not face to face. Prior to furnishing any precursor substance to a person in a transaction that is not face to face, a vendor shall require a letter of authorization that includes all of the following:
	  a.   	 The name of the person to whom the substance is to be delivered;
	  b.   	 The person’s residential or mailing address, other than a post office box number;
	  c.   	 The person’s residential telephone number, including area code;
	  d.   	 The person’s place of employment including employer’s address and telephone number;
	  e.   	 The person’s date of birth;
	  f.   	 The person’s place of birth;
	  g.   	 The person’s social security number;
	  h.   	 The person’s signature;
	  i.   	 A description that identifies how the substance will be used.
	 12.6(3) Furnishing to a business via transaction not face to face. Prior to furnishing any precursor substance to a business in a transaction that is not face to face, a vendor shall require a letter of authorization that includes all of the following:
	  a.   	 The name of the business;
	  b.   	 The business license number;
	  c.   	 The business address and telephone number, including area code;
	  d.   	 A description that identifies how the substance will be used;
	  e.   	 The signature of an officer, authorized agent, or authorized employee of the business;
	  f.   	 The typed or printed name and title of the signatory.