An investigation published Thursday by the Chicago Tribune shows that more than half of Chicagoland pharmacists did not warn patients of dangerous drug combinations. It’s the type of advice pharmacists are supposed to give to customers, but at both chains and independent shops, pharmacists routinely failed to speak up when filling two prescriptions that have known to interact and cause health problems for patients.  Morning Shift talks to Todd Lee, professor and head of research for pharmacy systems, outcomes and policy at UIC’s School of Pharmacy about the investigation, what type of medical knowledge pharmacists have, and what they are responsible for telling customers who fill prescriptions.