def rv12(mjd, hist=[], **kwargs):
    """cadence requirements for 12-visit RV plates

    Request: 12 total, ~3 per month, ideally within 1 week

    mjd: float, or int should be ok

    hist: list, list of previous MJDs
    """

    # covid 4 plug per night solution
    return True

    if len(hist) == 0:
        return True

    if len(hist) > 12:
        return False

    deltas = mjd - np.array(hist)
    this_month = deltas[np.where(deltas < 15)]

    if len(deltas) > 3:
        return False

    # would allow for observations more than a week after previous
    return np.min(deltas) > 1