I think the IR camera was more likely to have been looking for fever than drugs. I don't mean to say that Changi doesn't have drug-detection mechanisms, but the

I think the IR camera was more likely to have been looking for fever than drugs. I don't mean to say that Changi doesn't have drug-detection mechanisms, but the commonest use of IR cameras at international airport gates is to try to find passengers who are showing signs of infectious disease.