Law and Order 2 - Double or Nothing Walkthrough
Diana Quinn - Lab Helper

You get Diana Quinn's lab location by talking to the victim's wife at his residence.

Closely? Yes, IV fertilization
Secret project? Everybody knows the data. He was eccentric but not doing anything advanced
Resented him? Inconceivable, he was a genius. We all felt honored.
Get along? Yes
Why in Midtown? He left early to meet Donald Kent for drinks.
Who is Donald Kent? He founded the lab, Kent was always looking over our shoulder.

Refuses psychiatric exam

Law and Order 2 - Double or Nothing Walkthrough, Tips and Techniques