on belasco, the jedi discover that the population is suffering unusually severely from bacteria that recur in the drinking supply every seven years. they find senator s'orn caring for sick children, but she wants nothing to do with the jedi. eventually, they discover that s'orn has altered galactic senate transcripts for zan arbor, and that zan arbor is likely on the planet. suspecting that zan arbor has bioengineered the bacteria in order to make a profit selling a cure, the four jedi infiltrate the water purification plant, obtaining dated water samples as evidence.