ELECTRO-shock 'taser' weapons being tested by North Wales Police have not been properly tested according to Amnesty International.
The claim, despite Home Office assurances to the contrary, is made in a report called The Pain Merchants.
The pressure group claims British experts based the decision to trial tasers in the UK on experimental evidence from the manufacturers and US police departments that was described by Government scientists as 'not substantial' and 'limited.'
And they claim police scientists have even warned that in some circumstances, such as if a subject has been sprayed with CS spray or has strong alcohol on them, there is a chance that 'the subject and their clothing may be engulfed in flames.'
Amnesty International's report also details several cases from the US and Canada where subjects have died after being shot with tasers.
Now Amnesty International is calling for full medical trials to be conducted before authorities consider deploying tasers more widely.
The organisation has also raised concerns at the potential for abuse of the weapons.