I've heard that they don't always work. This is a big problem at their price especially when including the installation fee. Is there any way to test if they work before installing them? Is there a particular website or marketplace which is more reliable than others?
You ever try soaper powder/qauludes? I did once and like a dumbass drank beer on top of taking, I woke up laying in my backyard in the pouring rain, it knocked me out. I have not seen it around in many many years.