How do you know if a freelancer's portfolio and resume on are truthful?

[Btaliat]

Most clients at the end of the day, still fall prey of bad freelancers, despite checking their profiles and see incredible profiles. Unfortunately, some of the freelancers always doctor their profiles. Some of them lie to gain attention. That's why clients should try to do some things in order for them to know the best and the competent freelancers that they can trust. Relying only on the profiles can be very misleading. What else can be done by the clients.