The owner of Muscatine radio station KTNT, Norman G. Baker, spread misinformation which resulted in more farmers protesting the testing, sometimes violently.

Fifty veterinarians, all working in pairs and while being protected, gave injections to 5,000 cattle per day for a week.

Many respected medical professionals thought that cows were unable to transmit the disease to people, including Robert Koch, who completed early research on tuberculosis.

[1] The State of Iowa began requiring testing to reduce the frequency with which dairy cattle with tuberculosis could contaminate the milk supply and cause milk-drinking people to contract the disease.

[2] In 1929, the Iowa State Legislature passed a law requiring all dairy and breeding cows to be tested for bovine tuberculosis.

[2] On March 9, 1931, over 500 people protested at the south of Tipton at a farm owned by E. C. Mitchell, who had previously worked with four other farmers to resist the testing of their cows.

On April 14, 1931, Iowa veterinarians and 20 nearby police officers were at farmer William C. Butterbrodt's farm, northeast of Tipton, to test his cows for tuberculosis.

Veterinarian Peter Malcolm was forced off of E. C. Mitchell's farm in Cedar County on April 10, 1931, after Macolm succeeded in testing 12 cows.

Seventy-five protestors confronted Malcolm and several officials, resulting in Iowa agent Earl Gaughenbaugh telling the farmers to leave.

[1] Newspaper reporters were unable to write stories about the Mitchell farm incident due to protestors and The Des Moines Register and Tribune took photographs from the air that showed automobiles that were parked to prevent the farmers' cows from being tested.

The National Guard was deployed to Cedar Rapids on the morning of Malcolm reviewing the test results, but they were sent home shortly after on the same day.

To prevent the advancement of the officials, the farmers stopped them from entering the roads while attacking the veterinarians by throwing things at them including chamber pot contents.

[4] Machine guns were placed facing country roads, sentries patrolled the area, and armed outposts were built as soldiers and veterinarians traveled around Cedar County to test cows for tuberculosis; the farmers gave in for the most part due to the soldiers.

[4] The veterinarians saw no cows on Lenker's farm due to his selling his 21 cattle to farmer Harry Duffy in Muscatine County.

As he was not allowed to interfere with the process or move his cattle, Lenker was charged for contempt of court and conspiracy jointly with farmer Paul Moore for violating the tuberculin test law.