Does an open WiFi signal reduce your 4th Amendment protections?

Thomas O’Toole, writ­ing on the E-​​Commerce and Tech Law Blog, points to an inter­est­ing case recently decided in Oregon:

In United States v. Ahrndt, No. 08-​​cr-​​468 (D. Ore. Jan. 28, 2010), a fed­eral trial court held that a child pornog­ra­phy sus­pect had no con­sti­tu­tion­ally pro­tected pri­vacy right in the files found on his per­sonal com­puter, stored in a shared iTunes folder fed by a Limewire account, acces­si­ble by a neigh­bor who was pig­gy­back­ing on his unse­cured wire­less net­work.

via TechLaw: Court Finds Constitutional Significance in Defendant’s Failure to Password-​​Protect Home Wireless Network. (I rec­om­mend you read the whole piece by Thomas O’Toole.)

The neigh­bor con­nected to the open wire­less account, opened iTunes, and found child pornog­ra­phy shared by the (now con­victed) defen­dant. A police offi­cer who responded to her call guided her through open­ing one shared file, and saw child pornog­ra­phy. The police them pro­ceeded to gather details of exactly who’s net­work it was and obtained a war­rant — in turn dis­cov­er­ing more child pornography.

The defen­dant argued it was an ille­gal search by the police and the war­rant should be thrown out, since the ini­tial find­ing by the offi­cer vio­lated his 4th amend­ment rea­son­able expec­ta­tion of pri­vacy.

The court said, no, if you leave your wire­less router unse­cured, your expec­ta­tion of pri­vacy is much lower. People rou­tinely use unse­cured net­works of oth­ers, says the court, and set­ting a pass­word to pre­vent this is clearly laid out in the instruc­tions (in this case, Belkin’s). What’s more, if you have iTunes shar­ing turned on, you shouldn’t expect those files broad­cast to every­one on your net­work to be private.

I agree with O’Toole that none of this breaks new Constitutional ground. It all seems per­fectly rea­son­able to me, and it seems like the judge “gets it” with regard to tech­nol­ogy (nice to see).

It does also imply that an open wire­less net­work is not like a closed (but unlocked) door. Accessing it is not equiv­a­lent to break­ing and enter­ing. (I think this is the cor­rect view of things, myself.)

O’Toole ends with a warn­ing that you should password-​​protect your net­work if you want 4th Amendment pro­tec­tions. I would add that, if you choose to share your wire­less net­work, then make sure you secure your com­put­ers within that net­work. The lack of a pass­word for the net­work was only one fac­tor — shar­ing iTunes files pub­licly also contributed.

Extending this argu­ment, if you have pri­vate files, you should be able to get 4th Amendment pro­tec­tion by password-​​protecting them at any level (encryp­tion is a prac­ti­cal pro­tec­tion, but shouldn’t be nec­es­sary for legal pro­tec­tion — if one extends from this rul­ing). Thus, you could share your iTunes library and — pro­vided you pass­word pro­tect your finan­cial doc­u­ments — still have Constitutional pro­tec­tions for those doc­u­ments (but not the music or videos you are sharing).

Seems com­mon sen­si­cal, but that doesn’t mean that it’s nec­es­sar­ily “the law” every­where! This was only a fed­eral dis­trict court in Oregon, after all, and isn’t bind­ing prece­dent (though it may be per­sua­sive). But it’s an intel­li­gent deci­sion.