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The issue really isn't the domestic violence legal concern, because we only have the allegation of such (and no charges), but the impact of those allegations. So any penalty isn't for actual/legally defined DV, but for the fact that his actions failed the "sniff test:" They sure smell like something near to DV.
And the contract he freely signed recognizes the right of his employers (and the league) to penalize him for that transgression.
He will remain employed in MLB: I see no real reason why that can't be for the M's. Were he a repeat "offender" I would be a "hanging judge." He's not, as far as we currently know.
Standard MLB contract:
Conduct Detrimental or Prejudicial to Baseball
Players may be disciplined for just cause for conduct that is materially
detrimental or materially prejudicial to the best interests of Baseball
including, but not limited to, engaging in conduct in violation of fed-
eral, state or local law. The Commissioner and a Club shall not disci-
pline a Player for the same act or conduct under this provision. In cases
of this type, a Club may only discipline a Player, or take other adverse
action against him, when the Commissioner defers the disciplinary
decision to the Club.