How Do DACA People Prove That as Children They Illegally Immigrated with Their Parents Into U. S. What’s Standard?

Translate:

What’s to prevent an illegal immigrant from fraudulently saying that he/she came across the border as a child brought by mom and/or dad, and therefore, what is the standard of proof for the DACA people to establish that they came across the border as stipulated to qualify for DACA?