Although wild caught insects aren't the best there are some precautions you can take. I have fed most of my colonies insects from my back and front yard. I freeze the insect and then thaw it to kill any potential diseases. Not sure how much it helps to get rid of chemicals. Boiling is another way to kill the insect.
As Antdrew mentioned it's important to be aware of where you collect the wild insects. I am fortunate to have a fairly large yard, and I know no chemicals are used in there.
Something else I have fed my colonies as a protein source is turkey ham meat, the thin slices of meat that are used for sandwiches. I know some ants are willing to take human food. I would try to grab a couple of workers and test feed them a piece to check if the food is safe.
Good luck with feeding your colonies.
Edited by MrPurpleB, May 2 2021 - 10:45 AM.