Final answer:
An attorney representing a client in a non adjudicative proceeding before a legislative or administrative body must adhere to legal and ethical standards, prepare thorough briefs and arguments, and provide effective legal counsel as demonstrated in Strickland v. Washington and Padilla v. Kentucky cases.
Step-by-step explanation:
A lawyer representing a client before a legislative body or administrative agency in a nonadjudicative proceeding must act in accordance with the legal standards and ethical guidelines that govern legal practice. When the solicitor general determines the position the government will take and decides which cases should be appealed, legal counsel is essential for thorough preparation. Cases brought before the Supreme Court require that petitions, briefs, and oral arguments be prepared meticulously, often involving amicus curiae briefs to provide additional perspectives.
Furthermore, in proceedings like zoning appeals, which are quasi-judicial in nature, the complexity of the law makes it crucial for individuals to have legal assistance. Attorneys have the responsibility to advise their clients on matters such as the risk of deportation following a criminal conviction (as established in Padilla v. Kentucky), and a failure to perform these duties adequately can result in a violation of the Sixth Amendment right to effective legal counsel (as demonstrated in Strickland v. Washington).