Imprison and fine and grab the assets of those who hire them or rent to them. These things draw them like roadkill draws flies. If you leave food all over your kitchen you will soon draw rodents and roaches. Same principal. Deport all that are caught or seek Gov freebes. Hire more workers to move the process along faster than having them wait 3 years. Like in the days of our grandparents reject the unhealthy who would be a burden/danger to the country.