so here's the question: do they have probable cause to do so under these circumstances?
Probable Cause
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Definition
Probable cause is a requirement found in the Fourth Amendment that must usually be met before police make an arrest, conduct a search, or receive a warrant. Courts usually find probable cause when there is a reasonable basis for believing that a crime may have been committed (for an arrest) or when evidence of the crime is present in the place to be searched (for a search). Under exigent circumstances, probable cause can also justify a warrantless search or seizure. Persons arrested without a warrant are required to be brought before a competent authority shortly after the arrest for a prompt judicial determination of probable cause.
Constitutional Basis
Although the Fourth Amendment states that "no warrants shall issue, but upon probable cause", it does not specify what "probable cause" actually means. The Supreme Court has attempted to clarify the meaning of the term on several occasions, while recognizing that probable cause is a concept that is imprecise, fluid and very dependent on context. In Illinois v. Gates, the Court favored a flexible approach, viewing probable cause as a "practical, non-technical" standard that calls upon the "factual and practical considerations of everyday life on which reasonable and prudent men [...] act".1 Courts often adopt a broader, more flexible view of probable cause when the alleged offenses are serious.
Application to Search Warrants
Probable cause exists when there is a fair probability that a search will result in evidence of a crime being discovered.7 For a warrantless search, probable cause can be established by in-court testimony after the search. In the case of a warrant search, however, an affidavit or recorded testimony must support the warrant by indicating on what basis probable cause exists.8
A judge may issue a search warrant if the affidavit in support of the warrant offers sufficient credible information to establish probable cause.9 There is a presumption that police officers are reliable sources of information, and affidavits in support of a warrant will often include their observations.10 When this is the case, the officers' experience and training become relevant factors in assessing the existence of probable cause.11 Information from victims or witnesses, if included in an affidavit, may be important factors as well.12
The good faith exception that applies to arrests also applies to search warrants: when a defect renders a warrant constitutionally invalid, the evidence does not have to be suppressed if the officers acted in good faith.13 Courts evaluate an officer's good faith by looking at the nature of the error and how the warrant was executed.14
Probable Cause in the Digital Age
While the Fourth Amendment's probable cause requirement has historically been applied to physical seizures of tangible property, the issue of searches and seizures as applied to data has come to the Supreme Court's attention in recent years.
In Riley v California (2014), the Supreme Court held: "The police generally may not, without a warrant, search digital information on a cellphone seized from an individual who has been arrested." This would seem to group cell phones in with traditional items subject to traditional court tests and rules for searches and seizures.
Riley, however, did not end the inquiry into digital data's interaction with the Fourth Amendment. For the 2018 term, the Supreme Court has agreed to hear Carpenter v. United States. Carpenter, accused of several robberies, was arrested after "his phone company shared data on his whereabouts with law-enforcement agents."
Mr. Carpenter is challenging the "constitutionality of the Stored Communications Act, a law permitting phone companies to divulge information when there are 'specific and articulable facts' that are 'relevant and material' to a criminal investigation." His complaint states that "his privacy rights under the Fourth Amendment were violated when his phone company shared data on his whereabouts with law-enforcement agents." This case will likely have a significant impact on the role that probable cause plays in the ability of data companies to share user information with law enforcement.
1. See Illinois v. Gates, 462 U.S. 213, 232 (1983).
2. United States v. Humphries, 372 F.3d 653, 657 (4th Cir. 2004).
3. Prosecutor's Manual for Arrest, Search and Seizure, § 6-6(b) (2004).
4. See Mapp v. Ohio, 367 U.S. 643 (1961), at 648, 655.
5. See Ariz. v. Evans, 514 U.S. 1 (1995).
6. People v. Boyer, 305 Ill. App. 3d 374 (1999), at 379-80.
7. See Gates, 462 U.S. at 238.
8. Whiteley v. Warden, 401 U.S. 560, 564 (1971).
9. Prosecutor's Manual for Arrest, Search and Seizure, § 3-2(c) (2004).
10. See Franks v. Delaware, 438 U.S. 154, 171 (1978).
11. See United States v. Mick, 263 F.3d 553, 566 (6th Cir. 2001).
12. See United States v. Schaefer, 87 F.3d 562, 566 (1st Cir. 1996).
13. See United States v. White, 356 F.3d 865 (8th Cir. 2004).
14. See, e.g., United States v. Clark, 638 F.3d 89, 100–05 (2d Cir. 2011)
Probable Cause
This isn't about what I say, or even know.
This is the argument ONLY you must make, dear poster.
Better yet, dear poster, do YOU believe the police possess the requisite "probable cause" (as defined by law) to pursue what some term the "perp", the former friend?
Mere suspicion is nothing more than mere suspicion.
Suspicion can be present, and probable cause will never make an appearance.
Think of it this way, poster.
Mere suspicion can provide a law enforcement officer a reason to stop a person, but maybe not arrest the person.
The Difference Between Reasonable Suspicion and Probable Cause - Doyle Schafer McMahon LLP
That, dear poster, is why many crimes go unsolved.
On the other hand, that also ensures that society doesn't incarcerate innocents on suspicion alone, absent evidence and proof.
Looking/behaving guilty doesn't mean a person is guilty.
BTW, here are some very useful discussions about suspicion vs. probable cause:
Probable Cause Versus Reasonable Suspicion | Maricopa County, AZ
Reasonable Suspicion
https://www.hg.org/legal-articles/reasonable-suspicion-and-probable-cause-defined-49914
https://scholarship.law.upenn.edu/cgi/viewcontent.cgi?article=1133&context=penn_law_review_online
https://justice.utah.gov/Documents/Sentencing/ProsecutionManual/chapter6.pdf
Probable Cause vs. Reasonable Suspicion | Colorado Springs Criminal Defense Blog