When a screening test returns negative results,
no further testing is necessary
confirmation testing must also be done according to protocol
the subject should be arrested
the person is already dead

ANSWER:

If a screening test returns negative results, no further testing is necessary as there is no likelihood of any diseases.

EXPLANATION:

However, if the test turns positive, confirmation testing must also be done according to the protocol. A screening test is medical surveillance or procedure done on a particular individual from a particular group of population in order to assess the probability of their population having a certain disease.  Various diseases have various techniques and procedures for screening and each of them has their own ways of dealing with the results.

Ithink the answer is true.