Placebo-embedded IEM tablets are being tested to measure the accuracy of IEM detection by the MIND1 system. Approximately 30 healthy volunteer subjects will be enrolled in the substudy. The duration of this substudy from Visit 1 (Day 1) to safety follow-up will be approximately 1 week, of which approximately 1 day will be allotted for active subject participation, plus a 1-week safety follow-up period.