http://www.bussvc.wisc.edu/topic/contrsigauth.html

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Note added at 1 hr (2006-06-09 02:48:13 GMT)
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The University of Tennessee bylaws specify that only the president, vice presidents, or other officials to whom delegated authority has been granted may legally bind the University in contractual agreements. Only purchasing officers are authorized to sign and issue purchase orders to acquire goods and commercial services. Agreements, contracts, or purchase orders signed by other University employees are null and void and do not obligate the University to pay for goods or services.

http://www.utmem.edu/purchasing/signature_authority.html