Singapore, March 30 -- A district judge has urged lawyers to be sensitive about casting allegations of mental illness against a party in their litigation strategy.

The plea came in a rare postscript to a ruling on a custody tug-of-war between a split couple over their toddler son.

District Judge Kathryn Thong said a lawyer should not claim that a spouse has a mental disorder to boost his own client's case, noting that a wife's mental condition in itself does not disqualify her right to care and control of the child.

"Rather, it is the effect of such mental conditions and how it correlates to a child's welfare," said District Judge Thong.

She added in judgment grounds earlier this month that if a party argues that his spouse has a me...