The disadvantages include the perpetuation of bad rulings and the difficulties rose when there is no precedent for the case before the court. Once a bad decision has been made through a higher court, that decision will remain law until the same court, or a higher court, overrules the bad judgment. Courts are reluctant to overrule their own decisions unless absolutely necessary and so bad decisions may be upheld for a long time. That is true of bad precedents. However, a total lack of precedent can lead to many problems, especially where a court essentially has to make new law where no previous law existed.