Among the kinds of prejudice that may obtain from joinder of offenses are "1) the jury may cumulate evidence of the separate crimes; 2) the jury may improperly infer a criminal disposition and treat the inference as evidence of guilt; 3) the defendant may become `embarrassed or confounded'in presenting different defenses to the different charges. "

—"where a principal cause of postponement is the deliberate pace of the system of safeguards designed to protect the accused, the courts have been exceedingly reluctant to find constitutional infirmity even in very long delays."

One danger is that "the jury may use the evidence of one of the crimes charged to infer a criminal disposition on the part of the defendant from which is found his guilt of the other crime or crimes charged

It is quite apparent that appellant and his co-defendant by that time had exhausted "the system of safeguards designed to protect the accused."

—concurrent sentences cured any prejudice against defendant who testified on only certain counts of a multi-count indictment

In reviewing two cases where there were multiple charges against a defendant for acts arising out of a single transaction, the District of Columbia Circuit was faced with a derivative issue, merger of offenses. 54 44s The joinder in this instance appears to be pregnant with the prejudice envisaged by rule 14 since the evidence of burglary was circumstantial, whereas …

While misjoinder is error as a matter of law, "a refusal to grant severance is error only if it is an abuse of discretion."

Our "predominant consideration" when deciding whether offenses are properly joined is whether the joinder "would serve the goals of trial economy and convenience

The time spent in the dispute over the procedures to be used during appellant's mental examination at St. Elizabeths, and the delay caused by the two mental examinations, approximately five months, "are not normally taken into account for purposes of determining the question of a denial of speedy trial" since " `a principal cause of postponement [was] the deliberate …