When the police arrest someone today, they must follow certain agreed-upon procedures They are said to be following the rule of law. the separation of powers. due process. the legislative branch.

## Step 1<br />The question is asking about the legal principle that mandates the police to follow certain procedures when arresting someone. The options provided are: the rule of law, the separation of powers, due process, and the legislative branch.<br /><br />## Step 2<br />The rule of law is a principle that ensures that all members of a society, including the government, are subject to the same laws. It doesn't specifically refer to the procedures followed by the police when arresting someone.<br /><br />## Step 3<br />The separation of powers is a doctrine that divides the government into different branches, each with its own powers and responsibilities. This principle doesn't directly relate to the procedures followed by the police when arresting someone.<br /><br />## Step 4<br />The legislative branch is the part of the government that makes laws. This branch doesn't directly dictate the procedures followed by the police when arresting someone.<br /><br />## Step 5<br />Due process is a legal principle that ensures that the government respects all legal rights that are owed to a person according to the law. It balances the power of law of the land and protects the individual person from it. When the police arrest someone, they must follow certain procedures to ensure that the person's rights are respected. This is the essence of due process.