&quot;Probable cause&quot; isn&#x27;t even enough - all that does is let police go <i>get</i> a warrant.<p>To enter a house without needing a warrant (without the resident&#x27;s permission), the situation needs to be much more compelling than just probable cause. For example, if police are in the middle of pursuing someone and they see that person flee into a house, then they can enter it immediately. See <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Exigent_circumstance" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Exigent_circumstance</a>