Anchor: The chances of detecting a spike in toxicity would depend on the frequency of sampling, and the probability of missing spikes is high.
Entailed: It is quite possible that spikes in toxicity would be missed. 
Contradiction: It would be very improbable to miss a spike in toxicity. 
Contradiction: There is a girl preparing to slide down a ramp.
Contradiction: A kid is running down a walkway wearing a red jacket.
Contradiction: Questions do not lead to treatment 
Contradiction: A woman plays tennis while two men watch.