Scots should be forced to prove they are exempt from wearing a face covering in shops and public transport, a senior SNP MSP demanded.
The call was put to First Minister Nicola Sturgeon after claims shop assistants and bus drivers are "exasperated" by people flouting the rules.
Under current guidance, people do not have to prove any medical reason and should not be forced to cover up to use a bus or go shopping.
However, Christine Grahame, who is also a deputy presiding officer at Holyrood, suggested proof of medical exemption, and stiffer fines, would crack down on law breakers.
At First Minister’s Questions, Grahame said: "Bus drivers, store managers, shop assistants and the public often feel helpless and exasperated by the flouting of the use of face coverings by a growing minority, in my view."
Grahame asked: "Is the Scottish Government considering upping the ante by requiring individuals, if asked, albeit discreetly, evidence of their exemptions - I'm not suggesting GP notes by any means - together with stiffer fines? Both of which would deter non compliance, assist the police and provide that added protection for the travelling and shopping public and release shop managers, shop assistants and bus drivers from the pressure that's sometimes put upon them to do something."
Sturgeon said the rules on medical exemption need to be approached sensitively but the wider guidance will always be kept under review.
At Holyrood, Sturgeon said: "The police have got to continue to act with discretion, as they have been doing. In response to Christine Grahame's question about amending the enforcement regime, in a general sense we will keep that under review.
"We have changed the areas of enforcement on previous occasions and we will always consider doing that if we think that is necessary.
"Fixed penalty fines for non compliance will be something we consider. I think in terms of face coverings, people who have health reasons for not wearing one we have to continue to act sensitively to that. I know Christine Grahame does agree with that.
"Fundamentally we will have enforcement regimes in place, but all of us have a duty to do the right things for the right reasons."
She said the vast majority of people do comply. Anyone without a good reason should "really think about it" as a way to protect everyone else.
Official Scottish Government guidance states: "Those exempt under the guidance and regulations do not have to prove their exemption and should not be made to wear a face covering or denied access to public transport or shops. We ask for people to be aware of the exemptions and to treat each other with kindness."
