When making a purchase with National Drug Screening, payment can be made with credit or debit card or by certified check or money order. Once an order is processed, you will be emailed a receipt of the transaction within minutes of purchase. Always check you spam folder just in case your email provider flags the recipt as spam. How to get a receipt if you need a duplicate receipt or did not receive one via email … simply call 866-843-4545 and request a copy of your receipt via email, fax, or mail.