How do you check to see if someone has a fake car insurance card?

I heard it is easy to get one! My daughter just told me her Dad has one cuz he doesn't have car insurance cuz of two DWI. My son and her drive is cars cuz he can't drive. My son is 16 yrs old and she is 19yrs,old! I have phyiscal custody of my son! So, when he goes to visit he drives. I told him he can't but his Dad said he can. I do know what to do.