"All right, Miss Zatanna, you should go get some rest." Victor stepped forward, adjusted his glasses, and beckoned to the students still calibrating the equipment. "There should still be vacant dorm rooms. Take this young lady somewhere to rest. She can't keep forcing herself to hold on."
Then Victor looked at Batman again. "Do you remember the second piece of news I mentioned? The rainwater problem and the drinking water problem are not the same thing."
"The vast majority of Gotham City's drinking water comes from groundwater. The city's more than fifty water purification plants and its seven largest water companies are practically useless. Gotham City's drinking water conditions are not much better than those of the Middle Ages."
"I detected more than seventy hallucinogenic compounds in the groundwater. Their concentrations are low, but the proportions are precise. Someone must have deliberately poisoned it."
Victor sighed. "These hallucinogenic compounds are very likely the main reason the citizens went mad. But according to the clues Jason brought back, the poison in the water may have a delayed effect."
"Someone has been poisoning Gotham City's water supply for a long time. At first, this toxin might only cause mild hallucinations. In a city like Gotham City, being a little mentally dazed is no big deal. Many people probably wouldn't go to the hospital at all, and even if they did, they wouldn't visit the Psychiatry Department."
"But the toxin keeps accumulating in the human body and can't be metabolized. One day, when it reaches a certain threshold, the mysterious substance in the rainwater triggers and stimulates it, causing the citizens to descend into madness."
"At the same time, many of Gotham City's plants rely on the groundwater system too, so they've shown signs of going mad as well... But I don't know