I've been told that the no pest strips take too long for the pant process the poison.
So it isn't to be used in flower.
Just in veg.
It takes about the whole flowering cycle to process the poison from the no pest strips.

The plant does not process the chemical, the bugs do and they die. Like I said, the chemical permiates the air, not the plant. It is not a systemic like Avid. I don't thik the 2 or 3 days it takes to break the life cycle, will hurt your weed much in flower, but like I said, if you are trying to be safe I would not use these in flower or at all.