The Vatican has said when general absolution is permitted and when it is not. From JPII’s apostolic letter on the sacrament of Penance:
The use of General absolution is clearly defined as appropriate only when “
the danger of death is imminent and there is not time for individual confession or in cases of grave necessity. Grave necessity exists only when (1) there is a lack of confessors to hear confessions in an appropriate way and time and (2) penitents would be deprived of sacramental grace or Holy Communion for a long time (never to be interpreted as a period of less than a month).”
As an example of when General Absolution would be appropriate the Holy Father cites “mission territories or in isolated communities of the faithful, where the priest can visit only once or very few times a year, or when war or weather conditions or similar factors permit.”
General Absolution cannot be justified, however, simply because of the lack of a sufficient number of confessors at a great feast or pilgrimage, the desire to include a longer pastoral dialogue with the penitent, or due to the penitents’ preference for general absolution.
Judgement as to whether there exist the conditions required by Can. 961 §§1, 2 is not a matter for the confessor but for the diocesan Bishop who can determine cases of such necessity in the light of criteria agreed upon with other members of the Episcopal Conference. Indeed, the Holy Father directs that it would be appropriate for individual Bishops to inform the Episcopal Conference whether or not they are using General Absolution in their dioceses. [source"]source]("[
usccb.org/liturgy/innews/062002.shtml)]