Normally I wouldn't tag somebody like this, because I'd be suspicious that the purpose was to just dump the merit out of spite--not necessarily to give it to a specific person. However the receiving account used it to rank up, and that's good evidence that it was sent intentionally. That account might be an alt, but the merit might even have been sold, who knows.
What other factors do you consider before making the final decision ? Is there some standard guideline to be followed by all DT members ?