CCSD says students, staff affected by third party data breach. The Clark County School District says a vendor it uses has experienced a data security incident. The school district, in a press release, notes the incident involves several other school districts and involves an older version of a Pearson educational program. 559,8487 students who were enrolled between 2008 and 2019 along with a “smaller number” of staff members who were employed in the time period are also affected. LAS VEGAS (KSNV) — The Clark County School District says a vendor it uses has experienced a data security incident. Educational software provider Pearson is offering free access to credit monitoring services for individuals who were affected by the beach. Third-party company: Pearson Clinical Assessment (AIMSweb).