1. Observe the product label: When purchasing purple potato, pay attention to whether the product label or packaging is clearly marked with "genetically modified" or "non-genetically modified", which is the most direct way to confirm whether purple potato is genetically modified.

2. Seek professional identification: If you still have doubts about the transgenic status of purple sweet potato, you can contact professional agricultural product testing institutions or agricultural scientific research institutions for identification, and you can detect whether there are foreign genes in purple sweet potato by specific biotechnology means.