( ( On-site tests ) ( ( ( ( indicate ( ( ( positive and ) negative ) results ) ) and ) ( have ( a ( built-in control ) ) ) ) . ) )
(ROOT (S (NP (JJ On-site) (NNS tests)) (VP (VP (VBP indicate) (NP (ADJP (JJ positive) (CC and) (JJ negative)) (NNS results))) (CC and) (VP (VBP have) (NP (DT a) (JJ built-in) (NN control)))) (. .)))
On-site tests indicate positive and negative results and have a built-in control.
(ROOT (S (NP (PRP We)) (VP (VBP call) (NP (NP (DT an) (JJ incorrect) (NN test) (NN result)) (SBAR (WHNP (WDT that)) (S (VP (MD should) (VP (VB have) (VP (VBN been) (ADJP (JJ positive) (NP (NP (DT a) (-LRB- -LRB-) (NN n) (-RRB- -RRB-)) (ADJP (JJ false) (JJ negative))))))))))) (. .)))