Regarding that claim about the carcinogen gas (ethylene oxide) see https://www.reuters.com/article/factcheck-coronavirus-swabs-idUSL1N2P30YI https://www.reuters

Regarding that claim about the carcinogen gas (ethylene oxide) see https://www.reuters.com/article/factcheck-coronavirus-swabs-idUSL1N2P30YI https://www.reuters.com/article/factcheck-coronavirus-swabs-... , for example That an object has been exposed to a compound during that object's lifetime doesn't necessarily mean that you'll be exposed to that compound upon touching the object.