There are few ways to prevent the problem of regulatory capture except through limiting the ability of government to regulate commerce. The Founders saw regulation of commerce as entirely a state matter except with respect to foreign commerce, which was a Federal matter. There was always an issue with state governments showing favor to certain businessmen and companies and attacking others. Balancing that issue was the ability of a business to leave an unfriendly state to a friendlier one, a pattern we see in our day; as an example, gun manufacturers leaving unfriendly Connecticut for Southern states.
Banning “revolving doors”—and I mean a lifetime ban—would be a step in the right direction.
No federal employee should be permitted to ever work for a business they regulated—directly or indirectly.
Nobody in an industry should ever be allowed to work for any agency that regulates that industry—directly or indirectly.
That would probably resolve over half of the regulatory capture.