Exhibit 10.51 STOCK PURCHASE AGREEMENT This Agreement is made and entered into as of the 31st day of July, 2000, between MEDTOX Scientific, Inc., a Delaware corporation (the "Company") and each of the persons listed on Schedule 1 to this Agreement...51 Stock Purchase Agreement • March 28th, 2001 • Medtox Scientific Inc • In vitro & in vivo diagnostic substances • Minnesota
