A passenger who had not traveled by air in 15 years recently experienced a surprising incident during security screening, sparking online discussions. The individual shared their experience of being flagged twice at the arms-up scanner, leading to a conversation about potential reasons for triggering airport security alarms. The Transportation Security Administration (TSA) confirmed that sweat can play a role in setting off these alarms. A TSA spokesperson explained that added moisture from a person’s body can change the density of clothing, causing the Advanced Imaging Technology (AIT) machines to alarm. This may necessitate additional screening, such as a pat-down, to ensure there are no threats. The passenger’s situation has prompted a discussion about the causes of false alarms.