comic collector mike renaud.lenge not only renaud's credibility, but also his memory. >>> coming up. in 1990 you used marijuana and you drank alcohol on the weekends, did you not? >> so the strategy is go nuclear on mike renaud? >> i wouldn't say nuclear, no. we just brought out the facts. >> when "dateline" continues. [sfx: psst psst] allergies don't have to be scary. spraying flonase daily stops your body from overreacting to allergens all season long. psst! psst! all good >>> i'm dara brown. here's what's happening. the third week of testimony is set to begin in the derek chauvin murder trial monday. we expect the prosecution to call its 36th witness. medical examiner andrew baker testified friday. he conducted the autopsy last may. dr. baker restated his belief that the main factor in george floyd's death was law enforcement restraint. >>> and duke university announced new and returning students will be required to receive a covid-19 vaccine before entering for the fall semester. now back to "dateline." >>> o