... is that Pirates' catchers have only caught 4 baserunners in 53 stolen base attempts. (Barajas and McKenry have each caught two.)
The 7.5% CS rate is by far the worst in the majors (the MLB average is 27%, and the next lowest is Tampa Bay at 17%). For comparison purposes, last year the parade of 8 different Pirates catchers caught 25% of would-be stolen base attempts.
However, the Pirates are otherwise playing decent defense (10th in MLB dWAR, league average fielding percentage and defensive runs saved), and are currently 3 gaves over .500 and in second place in the NL Central.
I realize that in many cases bases are stolen off the pitcher, rather than the catcher, but allowing 92% of stolen base attempts to succeed doesn't bode well. In the minors, Tony Sanchez has thrown out 17 of 62 basestealers (27%), split between AA and AAA, but there doesn't seem to be much help for this year.