SINGAPORE, June 29 -- Singapore security firm Certis has clarified that it does not dismiss employees simply for not being at home while on medical leave, after internal WhatsApp messages about its medical leave policy circulated online and drew public attention.

The messages, which were first reported by Mothership on Friday, said that workers could receive a warning letter if they were found to be away from home during medical leave without a valid reason.

"If they are not at home, they should share their 'live' location or conduct a video call with their manager to ensure their safety and well-being," one message allegedly read.

Employees were also instructed to update their residential addresses to avoid potential disciplinary acti...