If the positive control does not produce the expected result, there may be something wrong with the experimental procedure, and the experiment is repeated.

For difficult or complicated experiments, the result from the positive control can also help in comparison to previous experimental results.

We therefore decided to include this model as a positive control in this study.

Furthermore, it is common that two or more positive controls are adopted in a single experiment.

I'd still feel better if I had more positive control of the situation, though.

It is far better to determine the moment of release by positive control from the ground.

However, this is a difficult positive control to get.

Sometimes the positive control takes the quadrant of a standard curve.

This gives some positive control over your heart's health and overall well-being.

And one of those aspects is positive control of the weapons.