August 2, 2012 Dear LabCorp and MEDTOX® Customers

1 August 2, 2012 Dear LabCorp and medtox Customers :We are pleased to announce that on July 31, 2012, LabCorp completed the acquisition of medtox Scientific, Inc. It is with great pleasure that we welcome all medtox Customers to acquisition combines two great organizations that provide exceptional quality, dependability and strong customer service. LabCorp and medtox Customers will now have access to the best of both organizations. In the near future, LabCorp s expansive menu of complex tests, years of testing expertise using sophisticated technologies, and nationwide network of more than 1700 patient service centers for convenient specimen collections will be available to you are a customer of both organizations, the current program of services and associated pricing from each company remain intact.

2 Please continue to contact your local representatives for either company until further guidance is provided. You may contact us at any time for more information on the transition Contact InformationE-mail: 888-281-6640 (Available Monday Friday, 8 am 7 pm, EST) medtox Contact InformationE-mail: 800-832-3244 (Available Monday Friday, 7 am 7 pm, CST)We value your business and look forward to a successful, long-term relationship. Sincerely,David P. KingChief Executive Officer