Hi Brightstars!
First, I don't want to sound mean to the other posters but I have a great deal of experience with scorpions... scorpions do not have eggs, they give live-birth to as many as 32 young and mom carries them on her back for a week or two afterwards till they are big enough to get along on their own. And they don't come up drains or come in your house looking for food. They have plenty of food outside. They are coming in seeking comfortable temps and WATER. They are HIGHLY attracted to water which is why peaple often find them in their sinks. Filling your sinks at night will probably only attract more. Getting rid of them takes time, even with a professional exterminating service. They can live as long as seven years and are very hardy! Dusting your attic with diatomatious earth helps. Sealing all the cracks in your house, including those around light fixtures, light switches, baseboards, etc. also helps. Pay special attention to recessed lights and ceiling fans. Check under the toe-jams and in the back of the cabinets in your kitchen and bathrooms and fill in any holes.