What two things are necessary to prove an exposure occurred?

Two Things that are necessary to prove an exposure has occurred are the following;

·         Changes in the surrounding such as the smell, sight or feeling. An example is when there is a presence of broken bottles that has a content of hazardous chemical and that there is a presence of strong scent.

·         Another thing observance of a leak or broken bottles or containers that contains with potential harmful pathogens, this should be reported right away because this can lead to serious consequences.

true. these things define the personality of the person.