Ok , I work with this type of information and let me tell you, this is 100% traceable.
The only way they could have compiled that type of data is running a particular name against a database. Even if they got "infiltrators", people aren't around disclosing their personal financial and demographic information to acquaintances. This was ripped by an employee (s) at the state's Medicaid office and/or community healthcare center.
I have inside knowledge on how the states' Medical coupon systems work - and the exact order of information gathered, as mentioned in that letter, describes the medical assistant database to a tee. I"ll also tell you that the incrase in demand for medical assistance caused by immigrant women means that many of these same employees owe their jobs to them. In WA, they've cut the budget for healthcare assistance and with the cut went a lot of jobs, which had been created by the same demand for care. But basic economic principles require too much thinking on their part.