Mo. Rev. Stat. § 521.040: Issuance on demands less than fifty dollars.

Attachments may issue from circuit courts for a sum less than fifty dollars and not less than five dollars, when, in addition to the affidavit herein required, it shall be stated by the affiant that the defendant has not, to affiant's knowledge, any goods, chattels, effects or credits, within the state, liable to attachment issued by an associate circuit judge. And in all cases where such attachment shall have issued, such court shall have and retain jurisdiction of the entire cause, and if the attachment is for any reason dissolved, such court may proceed to try the cause on its merits, the same as in cases of attachments for sums of fifty dollars or more.