What are the experiences of travelers arriving in Thailand with a negative PCR test but testing positive on arrival?

Big Bill comming Holiday is finit fast

Demand a second test. These tests are notoriously inaccurate and return many false positives.

Currently about 4% in the first week, according to the stats

unless you have a compelling reason is better to wait... you don't want to be taken off to the hospital and pay a lot of money

That just happened to me in Indonesia. I came from Dubai, where I took 2 PCR tests in the week prior to flying (last one 48 hours before departure), both negative, then positive at the airport in Indonesia. It's important to be aware if the country you're going to has tougher PCR tests. Indonesia, for example, was using CT levels of 40, which is higher than many other countries (they just yesterday dropped it to 35). I don't know what it was in Dubai, but the PCR test there was quite lax, they just put one swab up one nostril for half a second. In Indonesia, they do both nostrils + mouth/throat, for 2-3 seconds. It's also possible that I caught it on the airplane, as I took 2 flights, connecting through Sri Lanka.

There are many dozens of posts in the Thai travel groups of this happening. You won't see them in this group focused on visa advice, but there are at least a dozen very popular Thai pandemic-related travel groups on Facebook and your situation is posted about almost every day or two. Everyone must have a negative test to travel, so all positive arrivals are testing so upon arrival or on the Day 5 test. So far this month, close to 5000 travellers entering Thailand have tested positive this way, according to government statistics. I don't know if group rules allow me to post links to any of them, so you may have to do a bunch of searching, but I'll try as a comment below, and see if it is allowed.

Many have its on the official statistics