Yes u can buy salvage cars, and one you fix it you need to get state inspection. If u pass the inspection, the salvage title will be removed and will be replaced by a rebuilt title. Once you get the rebuilt title, you can register your rebuilt title car and drive it on public roads
NOTE: since it's a rebuilt title, when it comes to selling the car, you may need to sell it about 20% below the average price of a car with the same mileage and model
Example :if a clean title suzuki wagon R with 60 000km goes for 3 million, the same wagon R with 60 000kmbwith a REBUILT titled goes for around 2.7 million