'Honey Boo Boo' Cancellation -- The Evidence is On Wheels

TLC has plenty of evidence Mama June has been dating a convicted sex offender who molested her 8-year-old relative ... including the fact she went car shopping for the con.

As we first reported ... Mama June bought gifts for Mark McDaniel, who got out of prison in March after serving 10 years. We're told last month June went shopping for a used car ... a car we're told she was getting for McDaniel.

We know she went to at least one dealership near her home and said the used car was for her daughter. But sources say she was secretly car shopping for McDaniel.

Our sources say TLC also got wind of this. The car, the photo we posted, and other "compelling evidence" led the network to cancel the show ... despite June's denials.