Most of the anti-depressants involved in these cases are of the SSRI class and a few others. The majority of SSRI drugs are fluoride based, haloperidol is a halide (chemically related to fluoride).
Perhaps the question to ask is which is the more potent weapon? The drugs ? or The Gun?
Kazmierczak had recently stopped taking his medication and "had become somewhat erratic," Grady told reporters.