I am project manager in a reputed software firm and I have myself identified nearly 100 candidates with fake CVs. I have caught them during the process of technical interview. It is quite easy to spot these people.
Once I had to get 2 employees in my firm fired, since they joined the firm with fake CVs. I was routinely asking a few technical questions to these 2 people and to my astonishment found that these 2 people could not answer the most basic questions. It is then I grilled them and finally they confessed having faked their CVs. Immediately I brought to the notice of the HR and they had to terminate these 2 people.