Corruption, when done well, is almost impossible to detect.
Regulation, when done well, is almost impossible to corrupt. If you want to start a business in China, you will have to pay a bribe. I have started several business in the USA, and there is no where in the system for a bribe. The law says that the county clerk must issue the license. They have no discretion. When I lived in Shanghai, I had to pay a bribe so my kids could attend school. The rules are murky and unwritten, so the school staff has huge discretion of who can attend. In America the rules for admission are written down, clear, and publicly available. The system in China is designed to be corruptible, while the American system is designed to prevent it.
In America, nearly all of my interaction with local, state and federal government is through websites. It is difficult to get an under-the-table bribe through a website. When I have to deal face-to-face, such as at the DMV, it is at a public window in full view of other people. When I have had to deal with government officials in China, they often will lead applicants one at a time into private offices, out of view of the public. The corruption is pervasive and systematic, and their procedures are designed to facilitate it.