OK funny story time.
We always grow quite a few hot peppers and make hot sauce, can the pepper, dehydrate them and grind them up. So one day DW is grinding up habaneros in the blender, she has a damp towl over the blender, one wrapped around her head and face, gloves. I saw that and in typical male fashion laughed and asked are you doing? building a space ship or something? She said her skin burned. "get out of the way, I'll do it" Loaded up the blender and grind away no problem. I had it about 1/2 full and it wasn't grinding the top right so I took some out and shook up the blender to stir it back up and turned it back on. One small problem.... since I was looking right into the blender it should have been a sign that the lid was not on. I got a face full of pure habanaro dust, I have no idea if the stuff the cops use is anything like that and I have no desire to find out but instantly I couldn't see, couldn't get a breath, I was on fire. I'll give her credit for self control as she didn't laugh until she helped me to the shower, then she busted out laughing.
Steve