michael mac is wanted in connection to the shooting of tyrell polly and david dudley on october 4th. during the investigation, it was discovered mac had been robbed earlier and belief polly and dudley were responsible. mac's extradition is pending at this time. >>> abc2 news learned investigators turned up a second piece of tainted mail at the harford county detention center where a worker became ill last night. jeff hager joins us with the latest. >> investigators have the means the track down who sent the letter containing the substance and still looking in to whether an inmate played a role in the delivery. the employee became light headed and experienced a metallic paste in her mouth. she was transported to the medical center where she was treated and i release. the substance remains unknown. >> it's been sent to a may recall state police laboratory, it will take 30 days to confirm oh positively what the substance was. however, based on the reaction of the employee to what it was that she came acrossed we know it was nonbiological and more than likely had a narcotic base. >> the