In the U.S., large companies are using “audits” to drop people from the employer health plan.
The audit consists of a mass mailing to U.S. employees requiring them to prove that their dependents are entitled to health coverage. Employees are asked to provide either original or certified copies of marriage certificates, birth certificates, and adoption papers. Employees who can't provide this information within a certain period, like 90 days, are notified that their dependents can no longer have health insurance.
The audit disproportionately affects the lowest-paid workers because obtaining certified documents can be expensive. Depending on the county, it may also involve taking unpaid time off work to get the documents.