The Mid-Iowa Drug Task Force concluded a two-month investigation earlier this month, arresting three Marshalltown residents on drug charges.
Det. Joel Phillips, with the task force, said undercover narcotics officers purchased methamphetamine from Francisco Aguirre-Madrano, 22, May 22 at a home he shares with Raymundo Flores, 18, and Flores' mother, Maria Flores-Aguirre, 33.
Police arrested all three in a sting June 7, charging Aguirre-Madrano with delivery of meth, a Class B felony.
Flores is charged with possession of marijuana, a serious misdemeanor, and possession of drug paraphernalia, a simple misdemeanor.
Flores-Aguirre faces four counts of child endangerment, three counts of assault on a police officer, all Class D felonies; prohibited acts, an aggravated misdemeanor; and possession of meth, a serious misdemeanor.
Normally, child endangerment is an aggravated misdemeanor, but Phillips said with drug cases it is enhanced to a felony.
"Whenever drugs are involved, we don't know if the child has been injured at the time," he said. "But we can assume the child has been exposed."
Although police recovered less than .17 ounces of meth from the home at 502 N. 12th Ave. where the three live, packaging and the controlled purchase were enough to charge Aguirre-Madrano with the intent to deliver charge and Flores-Aguirre with the prohibited acts for keeping a drug den, Phillips said.
Flores-Aguirre's assault charges stem from her becoming combative when two Marshalltown Police officers and the Tama County Deputy Chief tried to arrest her.
"When she was taken into custody, she grabbed a 12-inch chef's knife and pointed it at the officers," Phillips said.
None of the officers were injured.
Flores-Aguirre received four counts of child endangerment for allegedly keeping the drug den while her four children - ages 11, 7, 4 and 2 - were also living there, Phillips said.
Aguirre-Medrano, father of Flores-Aguirre's youngest child, is being held at the Marshall County Jail on $100,000 cash bond.
Police released Flores the following day following day.
Flores-Aguirre made her appearance Monday where the judge issued her a public defender and ordered her to undergo a substance abuse evaluation. Her preliminary hearing is set for July 5.
A Class B felony is punishable by up to 25 years in prison.
Police made details of the arrest available Monday.