Could i come out positive for meth if they swab my hand for an ion drug test?

Sure: An ION drug test is a screening test. Like any kind of test, anybody's result can be positive or be negative. A person who tests positive is a true positive if she has the substance, but is a false positive if she has none of the substance. The technology can be helpful in other settings, such as screening passengers and cargo at airports for drugs and explosives.