Work ethics is a fortnightly feature in Guardian Work where a reader submits a workplace dilemma and asks for your help. A selection of the best answers will appear in Saturday's paper. (And if you have an office dilemma you'd like to share with our readers, please email us).

This week's question

A guy in my team has taken lots of sick days recently, claiming he has a back problem. However, a friend swears she saw him cycling through the park the other day when he was supposed to be at work! Should I dob him in to our boss? His absence always causes loads of extra work for the rest of us.

What are your thoughts?