Do mechanics know that used cars are accident cars and watch-adjusting cars?

I see. Used cars include soaking cars, accident cars and rice blending cars. Accident cars can be seen through the maintenance and replacement of auto parts, and watch-adjusting cars can be seen according to the degree of interior wear. Generally speaking, after 6,543,800 kilometers, there will be wear marks. Maintenance personnel contact with cars all the year round, so these details can be seen and known.