The National Police Chiefs Council (NPCC) has confirmed officers are being told not to install the NHS Covid-19 app on their work smartphones.
The app detects when users have been in proximity to someone with the virus.
Some officers have also been told they may not need to obey self-isolate alerts generated by the app when downloaded to their personal phones.
Lancashire Constabulary has told staff to call the force’s own Covid-19 helpline instead.
The BBC contacted the North-West of England force after a source claimed the advice had been given because of “security reasons”.
The source also said officers had been told not to carry their personal phones while on duty if they had activated the app.