Lynne Sachs's documentary traces business-card contacts with a detective and forensic help

Lynne Sachs's documentary *Every Contact Leaves a Trace* begins with a box of hundreds of business cards she kept over the years. Sachs said she hired a private detective at one point, and analyses from forensic investigators help her follow leads, Variety reports. The film, which had its Czech premiere at Ji.hlava, traces the people who contacted her.