What client behavior indicates a high risk for suicide that should lead the nurse to implement suicide precautions?

The behavior indicating a high risk for suicide is when a client has recently attempted suicide with a lethal method. This behavior reflects a clear and immediate danger because it demonstrates that the client has not only contemplated suicide but has also taken steps to carry out that plan, which is a strong indicator of serious intent to end their life. The use of a lethal method suggests a determined and possibly impulsive approach to suicide, emphasizing the urgency for nursing intervention and the implementation of suicide precautions to ensure the client's safety.

In contrast to this, showing interest in future activities may indicate hope or planning for the future, which is typically positive. Expressing regret about past actions might reflect self-reflection or remorse, but it doesn't inherently indicate a current risk for suicide. Finally, discussing feelings of control over thoughts may suggest a stable mental state, rather than a state of crisis. Therefore, the recent attempt, especially using lethal means, is the clearest and most alarming indication that immediate safety measures must be put in place.