US Sen. Warren seeks to pull pot shops out of banking limbo

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  • FILE- In this Sept. 20, 2016, file photo, Senate Banking Committee member Sen. Elizabeth Warren, D-Mass., questions Wells Fargo Chief Executive Officer John Stumpf on Capitol Hill in Washington. Warren is leading a new effort to make sure vendors working with marijuana businesses don't have their banking services taken away. (AP Photo/Susan Walsh, File)

    FILE- In this Sept. 20, 2016, file photo, Senate Banking Committee member Sen. Elizabeth Warren, D-Mass., questions Wells Fargo Chief Executive Officer John Stumpf on Capitol Hill in Washington. Warren is leading a new effort to make sure vendors ... working with marijuana businesses don't have their banking services taken away. (AP Photo/Susan Walsh, File) (The Associated Press)

  • FILE- In this Sept. 16, 2015, file photo, customers shop for marijuana inside a recreational marijuana store in Denver. Sen. Elizabeth Warren, D-Mass., is leading a new effort to make sure vendors working with marijuana businesses don't have their banking services taken away. (AP Photo/Brennan Linsley, File)

    FILE- In this Sept. 16, 2015, file photo, customers shop for marijuana inside a recreational marijuana store in Denver. Sen. Elizabeth Warren, D-Mass., is leading a new effort to make sure vendors working with marijuana businesses don't have their ... banking services taken away. (AP Photo/Brennan Linsley, File) (The Associated Press)

As more marijuana shops take root in states that have legalized the drug, they're struggling with a lack of access to the kind of routine banking services other businesses take for granted.

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Democratic Massachusetts U.S. Sen. Elizabeth Warren is leading a new effort to make sure vendors working with legal marijuana businesses don't have their banking services taken away.

The vendors include chemists who test marijuana for harmful substances and firms that provide security for pot shops.

It's part of a wider effort by Warren and others to bring the burgeoning $7 billion marijuana industry in from a fiscal limbo she says forces many marijuana shops to rely solely on cash.

Warren says helping marijuana-based businesses move away from a cash-only model also will help ensure they're paying their taxes.