[A] The court may refuse to apply promissory estoppel against the government if the ‘public interest’ suffers in fulfilling the promise.
[B] The government cannot be compelled to carry out a promise which falls outside its power and contrary to law.
[C] The promise in question may be tentative or uncertain and it need not to be unambiguous and unequivocal.
[D] There can be no promissory estoppel against the Legislature in the exercise of its legislative functions