Kim Zolciak says she's witnessed her estranged husband, Kroy Biermann, smoke pot -- and she's afraid for her kids' safety -- asking a judge to step in and force him to get a drug test.
According to legal docs, obtained by TMZ, Zolciak says she's got serious concerns for the safety and well-being of her 4 minor kids while in Kroy's care ... and she points to his marijuana smoking as the source of her fear.
Zolciak is asking the judge to force Kroy to submit to a five-panel hair follicle drug screen ... and that he not cut or remove any of his hair until the screen is complete.
TMZ broke the story ... both Kim and Kroy filed separate petitions for divorce last week. Both are asking for sole physical custody of their kids ... and Kroy's asking for sole legal custody as well.
We were also the first to report the estranged couple's financial problems, owing more than $1 million to the IRS. In his divorce docs, Kroy asks Kim to retain all financial documents -- including expense reports as well as income and tax records.
Kim states she and Kroy are still living under the same roof with their kids, the same home that went into foreclosure earlier this year ... but you gotta imagine tensions are running high between the two.
We covered the drama in the latest episode of The TMZ Podcast, available on all podcast platforms.