Swabs will be taken away for analysis

Police said the action followed two incidents in which wardens were spat in the face. One of the attackers was a pedestrian, the other a cyclist.

All 65 wardens will be able to use the kits to collect samples of spittle which can be taken away for analysis.

Inspector David Legge, of Lothian and Borders Police, said the force would make full use of the technology.

"Even just the thought of being spat upon will sicken and repel most people and nobody should have to work with the fear of this happening to them," he went on.

'Powerful tool'

"We will not accept violence or the threat of such for carrying out their duties.

"People who choose to resort to physical means will be pursued and the powerful tool of DNA profiling used for that purpose.

"The public will by now, be aware of just what can be done in the DNA evidence arena and we intend to fully use it."

Train and bus staff in parts of Scotland have been issued with similar kits to increase the chances of catching their attackers.