A Colorado social services department has been in touch with L.A’s Department of Children and Family Services, as part of a routine investigation into the welfare of Charlie Sheen‘s 9-month-old twin sons, Bob and Max.

This kind of follow-up is standard procedure in cases that involve a charge of domestic violence, reports E! Online.

Charlie was arrested on suspicion of felony menacing and assault on Christmas Day for allegedly threatening wife Brooke Mueller with a knife. The case is due in court Feb. 8.

Aspen’s Pitkin County officials learned that there are no outstanding investigations concerning the Two and a Half Men star’s kids in LA.

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