A fifth person has been arrested in a Nassau County, Florida, child-neglect investigation after a 1-year-old allegedly ingested methamphetamine from a sippy cup and was treated for an overdose.

Deputies arrested Mark Allen Windham, 46, on Saturday, August 22. He faces one count of child neglect causing great bodily harm and a separate charge involving drug paraphernalia with residue.

The charges are allegations. Windham has not been convicted, and the evidence described in arrest reports has not yet been tested in court.

Witnesses described what went into the cup

The investigation began on February 24 after adults brought the toddler to a hospital. FOX 35 Orlando and Action News Jax reported that the child was vomiting and required treatment for a methamphetamine overdose.

According to the Nassau County Sheriff's Office, two witnesses alleged that Windham poured the contents of his own cup into the child's sippy cup. Investigators say a bag containing meth was inside the cup from which the toddler later drank.

Authorities have not released the child's name, and it is not included here. The public interest is in the adults' alleged conduct and the systems that allowed a dangerous drug to reach a toddler—not in identifying a child who cannot consent to permanent online exposure.

Deputies say the emergency call was delayed

The case extends beyond the allegation that drugs were placed in the cup. Investigators say other adults present did not call 911 immediately after the child became sick.

That alleged delay is central to the neglect inquiry. In a suspected poisoning or overdose, every minute without medical care can affect the outcome. The toddler survived after hospital treatment, according to the reports.

Four other adults had already been arrested in connection with the investigation before Windham was taken into custody. The specific allegations differ by defendant, and an arrest in the same case does not establish that every person had the same knowledge or responsibility.

The fifth arrest does not close the case

Windham was booked into the Nassau County jail. Local reports listed bonds exceeding $25,000 on the neglect count and $2,500 on the paraphernalia charge.

Prosecutors will still need to show what Windham knew, what he allegedly put into the cup and how the substance was connected to the child's medical condition. Defense counsel will be entitled to challenge the witness accounts, laboratory evidence and chain of custody.

The investigation also raises broader questions about the child's environment: how methamphetamine came to be within reach, which adults were responsible for supervision and why emergency care allegedly was not sought at once.

Those questions belong in sworn testimony and court records, not speculation about the child or the family. The latest arrest is a major development, but it is still the beginning of Windham's case—not a verdict.

The toddler's survival is the most important fact in the story. The next is that five adults now face the legal consequences of what deputies say happened around one small cup.

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