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It is impossible to predict if a particular bloom is producing toxins unless expensive laboratory tests are used . These traits were observed in usability testing participants and are expected to be common among novice end users . Where liquidation values were not provided by the survey , EPA applied only the ATCF test to identify baseline and regulatory closures . Volunteers will visit the Soldier Systems Center on four separate occasions for an informational briefing , medical clearance , aerobic fitness test and food activity records before spending 12 consecutive days and nights for the actual study . Visitors are met with background images conveying the common difficulties of having the disease , including invasive and uncomfortable X-rays , myograms , bone scans and blood tests .