on september 16, 1999, barker was in washington, d.c., to testify before congress regarding hr 2929: the captive elephant accident prevention act, the proposed legislation that would ban elephants from traveling shows (i.e., circuses). while preparing for the presentation, barker experienced what he called "clumsiness" in his right hand. he was admitted to george washington university hospital and diagnosed with a partially blocked left carotid artery. barker underwent carotid endarterectomy to remove the blockage. the procedure went well enough that he was able to return to work within the month.