According to Vice, people are using photo editing software to doctor COVID test results.
"I just fired up photoshop and changed the date," wrote one man who had doctored results for an entire group of friends to Motherboard. "Fun fact, the document [test result] was in French whereas they were in Sweden the day it was supposedly made, but they didn't see a problem in that."
The other person took a slightly less sophisticated route and changed the date of an old test with Microsoft Paint for his vacation to Southern Europe.