Adding raw chicken to a meal that is being reheated So, a friend of mine told me they frequently add raw chicken to their (already cooked) leftovers when reheating (in a pan) to top them up. Though they stress that the chicken is completely cooked by the end of the reheating.

I feel like this is extremely unsafe in terms of food hygiene and food contamination, but apparently my friend and most of their family members have done this quite frequently without issue.

Other than the reheated food being overcooked and degraded in quality, I am not sure how I could explain  that this isn't a safe practice. Or am I completely wrong in this matter?
If a dish, any dish, leftovers or otherwise, has raw chicken added to it, then is cooked until said chicken is fully cooked, it is then safe to eat. There is nothing from what you describe that justifies assuming that the way the dish is handled would be unsafe.