According to the Iowa Implied Consent Law:

Question

Under Iowa's Implied Consent Law, any peace officer may ask you to submit to a breath, urine, or blood test if the officer feels you may be driving under the influence of alcohol or drugs. This applies to both resident and non-resident drivers. If you take the test and fail, or you refuse to take the test, your license can be taken away on the spot.

Accepted Answer

Both of the above.

Answer

An arrested driver may be asked to submit to a chemical test to determine the alcohol content of their blood.

Answer

Refusal to submit to chemical testing will result in a driver's driving privileges being withdrawn.