Earlier quoted context omitted.
You can tell if someone knows what they are doing by talking to them and having them walk you through what they have worked on. Also, in the United States, you could fire someone easily if they were really incompetent. Considering how much time and money people spend per candidate to interview, it's probably much cheaper and more efficient to hire faster and fire faster. Some companies are spending tens of thousands…
>it's probably much cheaper and more efficient to hire faster and fire faster. Reality is otherwise. Lots of paperwork involved (for both hiring and firing). And leads to a not-too-great work culture.
There is very little paperwork required to fire someone.
If the employee is still on contract (ala contract-to-perm) just collect their badge and be done with it.
If they are a W-2 employee with benefits, you hand them a few benefits notice forms and send them on their way.
If they apply for unemployment, the company will get a notice that the former employee has applied for benefits.