And if only those with the means to have a DNA test can have multiple husbands, would this not constitute a blatant discrimination policy based on economic wealth?
Not any more than saying that a man can only marry more than one woman only if he can afford it. Do you think a poor man can have more than one wife if he can't afford to feed and clothe them? Yet a rich man can have three or four? Would you call that discrimination?
Seriously, in the majority of the world a kit they sell at drugstores easily solves this problem.