By Zack Whittaker for Zero Day

The United Nations' special rapporteur on privacy has lambasted a spate of new surveillance laws across Europe and the US, saying that there is "little or no evidence" that mass monitoring of communications works.

In a report published this week, Prof. Joseph Cannataci, the first privacy watchdog to take up the post, said he was neither convinced of the effectiveness or the proportionality "of some of the extremely privacy-intrusive measures that have been introduced by new surveillance laws."

He also said that bulk records collection, such as call and email metadata, runs the risk of "being hacked by hostile governments or organized crime."