Here’s a more detailed description for those that like to read up: https://rarehistoricalphotos.com/nasa-spiders-drugs-experiment/
Curiously enough when a similar experiment was first performed decades earlier the original intent was to get the spiders to weave their webs during different times of the day, rather than alter the pattern.
Can be used as an insecticide.
It can be a poison to humans too - the poison is in the portion, after all.
Even in minute amounts. It’s the whole reason plants started producing caffeine. But you have also run into the big flaw in this, what is the portion they are using?