I’ll say mine was a light infestation. One spraying and that was the last I saw of them. Plants did not seem affected at all, almost liked it.
I haven’t harvested most yet and wonder if washing them would do any good.
I’m sure I’ve smoked more spinosad than I’m aware back in my pre- growing days.
I’m sorry, I don’t have any answers regarding the details. This information is fairly new to me as well. I just know spinosad is something I have been avoiding unless absolutely necessary, and I’m looking for an alternative. It does however, totally devastate thrips. So only in veg is my recommendation until I can find more information. 
Thank you @PlantShepherd, I always appreciate your advice and experience. You try to keep us on the straight path.
Think about all the eagle 20 we’ve smoked over the years. I’ll take the spinosad 