NOTE:I take lessons(VFR student pilot in training)and fly out of David Hooks airport in Tomball Tx. I am about 80-85% toward getting PPL yesterday during a briefing with my Flight instructor, he mentioned that recently, DPE's in Harris County(Houston TX)had been failing ALOT of students going on their Checkrides. we chatted about that and then we proceeded on the plane/ my lesson(great lesson!). about 2 hours later, we landed,returned to the school, he signed my logbook, and had to go. I noticed that our schools CFI was in the office and ask him what he knew about recent checkride failures and this is what he told me. in the last 9 months(more or less) the school had scheduled several checkrides with PE's within Harris County and other cities throughout Texas. (evidently there is a shortage of PE's in Houston now, causing scheduling problems, so the school has contacted and schedules checkrides PE's in other cities). of the students pilots who did their checkride in other Texas cities,100% of them passed. only 50% of the students who had checkrides IN Houston....passed. the CFI has spoken with other schools in Houston and its not just going on with our school. and the number of students who have gone for checkride with our school is between 10 and 20 people. what conclusions would you draw from this?