The best information from the 20/20 is the dot code. I was told this a long time ago but forgot about it. I think most of the problems are with truck/suv tires that have more aggressive and deeper tread patterns.
I also thought it was bogus to show truck retreads by the side of the road. Our press has developed the Rupport Murdock syndrome that dramatizes everything more just for ratings.
I think many of us are going to check those dot dates on all our cars very soon. At the very least if the tires are over six years old they should be changed out at half tread in my opinion. I have original spare p2000 from some cars I bought. Anyone want a deal on new tires lol.