That's why a screening is needed. If people lie, it won't make me lower my standards.

I'm dealing with this all the time in recruitment. It can be done. People lie all the time or don't read the requirements. You need a way for the ones who really do know how to do the thing you need to demonstrate it to you.

Have you ever been in a situation where you had to hire someone to help you with something? Would you really follow your own advice? Your advice does not make sense for carpenters, cooks, or drivers. Why should it make sense for programmers?