Also, she noted that so far it's legally unresolved whether police can copy data from an arrestee's phone for future examination.

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While Justice Kennedy agreed that DNA sampling constituted a search of an arrestee's body, he said he considered it a minor intrusion.

WSJ: Supreme Court: Police Can Take DNA Samples in Arrests

One of the last important federally funded studies of this sort, the Arrestee Drug Abuse Monitoring program, had its cash cut off and ceased operation.

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But "if in the future police analyze samples to determine, for instance, an arrestee's predisposition for a particular disease, " additional court review could be necessary, he wrote.

WSJ: Supreme Court: Police Can Take DNA Samples in Arrests

Also, depending on the use of location-enabled services or apps that store data on the phone, the police might also be able to infer the arrestee's past whereabouts.

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The guy held up both hands like an arrestee.

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It allows police in California to access any data stored on an arrestee's phone: photos, address book, Web-browsing history, data stored in apps (including social media apps), voicemail messages, search history, chat logs, and more.

CNN: STORY HIGHLIGHTS

The ruling allows police in California to access any data stored on an arrestee's phone: photos, address book, Web browsing history, data stored in apps (including social media apps), voicemail messages, search history, chat logs, and more.

CNN: STORY HIGHLIGHTS

Depending on who's getting arrested, and for what, warrantless searches of cell phone data could have wide-ranging potential to implicate not just the arrested person, but also to draw police attention to other people who might be involved (or merely associated) with the arrestee.

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