Mr. Westby and 15 others filed suit claiming unlawful arrest. The Supreme Court will decide two issues. One is whether officers violated the partygoers for the moment right by arresting them without probable cause and two, whether officers are covered under qualified immunity. Thereby protecting them from being held liable for damages in civil proceedings. We will hear arguments first this morning in case 151485, the district of columbia versus westby. Mr. Kim. Mr. Chief justice, may i please the court. Probable cause is a practical standard. It often accounts for the practical limitations that officers face when making arrest decisions, including the inability to look directly in the mind of suspects offering explanations for suspicious conduct. In a case like this, what they have established and circumstantial evidence is strong or at least fair, arrest is reasonable and constitutional and more clearly qualified immunity applies. Lets turn to the circumstances and consider them from