Nevertheless, extreme vigilance and monitoring are still needed each time a new product is sanctioned for release into the environment.

'That price has always been extreme vigilance,' the QC said.

He was spared, he says, only because of his extreme vigilance.

Despite their extreme vigilance they encountered no one.

Reprisal attacks cannot be ruled out so extreme vigilance is advised especially in the Jos area.

At the very least, legal specialists say, they should proceed with extreme vigilance.

His career has been characterized by extreme vigilance, as people who know him point out.

All the more reason to exercise extreme vigilance.

Therefore, extreme vigilance will be required in all respects throughout these six months.

Above all, there must be extreme vigilance to ensure that testing is not allowed to become a retrogressive influence.