Domestic Violence, aka DV, isn't a crime by itself, but rather a "tag." You don't have to have any physical contact to get the "DV tag."
You can catch your significant other giving a bj to a dude in his car, throw rocks at his car, and get charged with criminal damage/DV.
You can catch her out in public making out with a dude, throw a fit, scream, call her names, and otherwise cause a disturbance, and get charged with disorderly conduct/DV.
You can plant a recording device, track her phone activity, or plant a GPS tracker on her (to catch her/confirm your suspicions) and get charged with various crimes that will all carry a DV tag.
A friend of mine, and former RB for ASU/the Cardinals (not saying much more) was arrested and charged with a crime carrying a DV tag for snatching his wife's phone from her hands after suspecting (and confirming) she was texting her extra-marital lover.
It's easier than you guys think to get hemmed up for "DV."