With respect, this is repetition
This has been discussed on this thread. Contamination was only one of the errors discussed. There are many reasons for trace readings. And there seems to be considerable questions over the devices, their maintenance and use.
Anyhow, this is all academic. Indian politicians are never going to change this but hopefully even our scientifically illiterate masters are not daft enough to implement a similar system here
Last edited by Radgirl; 11th Aug 2017 at 14:05.