Yes they do.
From the man who works at the rainbow ranch.
Taco Bell serves more than one billion burritos and more than two billion tacos every year.
1 1/2 oz. of seasoned ground beef, 1/2 oz lettuce, and 1/4 oz of cheddar....to make it supreme add 3/4 oz of sour cream and 1/2 oz of tomatoes.
Yes, there is sand in Taco Bell's tacos.