I manage a home that had a scorpion infestation. It took years to get rid of them. None of the over the counter chemicals and or poisons were affective.
Here is what we did to get rid of the problem and it worked like a charm.
Step 1. Buy glue traps
Step 2. Buy black light
step 3. buy handheld propane torch
Set the glue traps throughout the perimeter of your home. This catches the scorpions. Remember females carry their young on their backs. Hundreds and hundreds of them.
Use the black lite to search for them in the evenings. Torch them on the spot. this ensures you burn all of the young on the females backs. It takes about a month of diligent work to get it done but itll work.
Let me know if you have any questions and I can discuss further.