For a few weeks in India, we had a string of third-country nationals (I won't say which, but it's not hard to find) apply for foreign medical graduate visas. We weren't familiar with the context in country they were coming from. They seemed to be generally good quality applicants and many were approved. It turned out that there was a cheating scandal in that third country, an entire batch of test results had been invalidated, and the embassy located there was refusing their visas, so a few applied in India and were approved, then word got out and more came. We eventually wised up. However, there was really no good reason for these applicants to be travelling from their home country to India for a visa appointment even under normal circumstances (India isn't exactly known for having short visa wait times).